Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0001401 SAM complex	IBA GO_REF:0000033	ACCEPT	Summary: SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex. Reason: SAM complex membership is a core cellular component annotation for SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3)
GO:0045040 protein insertion into mitochondrial outer membrane	IBA GO_REF:0000033	ACCEPT	Summary: SAMM50/SAM inserts and assembles mitochondrial outer-membrane beta-barrel proteins such as TOM40 and VDAC. Reason: Protein insertion into the mitochondrial outer membrane captures the central biological process of SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3) file:human/SAMM50/SAMM50-deep-research-falcon.md Primary function: SAMM50 is the core insertase/chaperone of the SAM complex that assembles mitochondrial outer membrane β-barrel proteins (including Tom40 and VDACs) in an energy-independent manner. (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005737 cytoplasm	IEA GO_REF:0000044	REMOVE	Summary: SAMM50 is an outer mitochondrial membrane beta-barrel protein, not a cytoplasmic protein. Reason: The cytoplasm annotation conflicts with the curated outer mitochondrial membrane localization and likely reflects a broad or transferred location call. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005739 mitochondrion	IEA GO_REF:0000044	MODIFY	Summary: SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization. Reason: Use mitochondrial outer membrane rather than the broad parent term mitochondrion. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005741 mitochondrial outer membrane	IEA GO_REF:0000044	ACCEPT	Summary: SAMM50 is an outer mitochondrial membrane Omp85-family beta-barrel protein. Reason: Outer mitochondrial membrane localization is central to SAMM50 topology and function. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0019867 outer membrane	IEA GO_REF:0000002	MODIFY	Summary: SAMM50 is in an outer membrane, specifically the mitochondrial outer membrane. Reason: The taxon/gene-specific evidence supports mitochondrial outer membrane as the precise location. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005515 protein binding	IPI PMID:25416956 A proteome-scale map of the human interactome network.	MARK AS OVER ANNOTATED	Summary: SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding is less informative than its insertase and complex annotations. Reason: Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0005515 protein binding	IPI PMID:27059175 SAMM50 Affects Mitochondrial Morphology through the Associat...	MARK AS OVER ANNOTATED	Summary: SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding is less informative than its insertase and complex annotations. Reason: Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0005515 protein binding	IPI PMID:32296183 A reference map of the human binary protein interactome.	MARK AS OVER ANNOTATED	Summary: SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding is less informative than its insertase and complex annotations. Reason: Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0005515 protein binding	IPI PMID:33961781 Dual proteome-scale networks reveal cell-specific remodeling...	MARK AS OVER ANNOTATED	Summary: SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding is less informative than its insertase and complex annotations. Reason: Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0005739 mitochondrion	IDA GO_REF:0000052	MODIFY	Summary: SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization. Reason: Use mitochondrial outer membrane rather than the broad parent term mitochondrion. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005737 cytoplasm	ISS GO_REF:0000024	REMOVE	Summary: SAMM50 is an outer mitochondrial membrane beta-barrel protein, not a cytoplasmic protein. Reason: The cytoplasm annotation conflicts with the curated outer mitochondrial membrane localization and likely reflects a broad or transferred location call. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0001401 SAM complex	IPI PMID:17510655 Conserved roles of Sam50 and metaxins in VDAC biogenesis.	ACCEPT	Summary: SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex. Reason: SAM complex membership is a core cellular component annotation for SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3)
GO:0005741 mitochondrial outer membrane	NAS PMID:31387448 Mitochondria-hubs for regulating cellular biochemistry: emer...	ACCEPT	Summary: SAMM50 is an outer mitochondrial membrane Omp85-family beta-barrel protein. Reason: Outer mitochondrial membrane localization is central to SAMM50 topology and function. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0045040 protein insertion into mitochondrial outer membrane	NAS PMID:31387448 Mitochondria-hubs for regulating cellular biochemistry: emer...	ACCEPT	Summary: SAMM50/SAM inserts and assembles mitochondrial outer-membrane beta-barrel proteins such as TOM40 and VDAC. Reason: Protein insertion into the mitochondrial outer membrane captures the central biological process of SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3) file:human/SAMM50/SAMM50-deep-research-falcon.md Primary function: SAMM50 is the core insertase/chaperone of the SAM complex that assembles mitochondrial outer membrane β-barrel proteins (including Tom40 and VDACs) in an energy-independent manner. (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0030150 protein import into mitochondrial matrix	IDA PMID:15644312 Dissection of the mitochondrial import and assembly pathway ...	MODIFY	Summary: SAMM50 handles outer-membrane beta-barrel substrates after TOM translocation, not matrix-targeted presequence import through TIM23. Reason: The original Tom40 pathway evidence is better captured by protein insertion into mitochondrial outer membrane. Proposed replacements: protein insertion into mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3) file:human/SAMM50/SAMM50-deep-research-falcon.md Primary function: SAMM50 is the core insertase/chaperone of the SAM complex that assembles mitochondrial outer membrane β-barrel proteins (including Tom40 and VDACs) in an energy-independent manner. (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005739 mitochondrion	HTP PMID:34800366 Quantitative high-confidence human mitochondrial proteome an...	MODIFY	Summary: SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization. Reason: Use mitochondrial outer membrane rather than the broad parent term mitochondrion. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005515 protein binding	IPI PMID:31644573 Armadillo repeat-containing protein 1 is a dual localization...	MARK AS OVER ANNOTATED	Summary: SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding is less informative than its insertase and complex annotations. Reason: Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0001401 SAM complex	HDA PMID:26477565 Evolution and structural organization of the mitochondrial c...	ACCEPT	Summary: SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex. Reason: SAM complex membership is a core cellular component annotation for SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3)
GO:0007007 inner mitochondrial membrane organization	IC PMID:26477565 Evolution and structural organization of the mitochondrial c...	KEEP AS NON CORE	Summary: SAMM50 contributes to inner-membrane/cristae architecture through SAM-MICOS/MIB contact sites, but this is secondary to its core SAM insertase role. Reason: The annotation is supported as a downstream organizational role of the MIB/SAM-MICOS axis rather than the primary evolved molecular function. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0140275 MIB complex	HDA PMID:26477565 Evolution and structural organization of the mitochondrial c...	KEEP AS NON CORE	Summary: SAMM50 participates in the mitochondrial intermembrane-space bridging (MIB) complex/contact-site axis with MICOS components. Reason: MIB complex association is supported but is treated as a contact-site/architecture role secondary to SAM beta-barrel insertion. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0005739 mitochondrion	IDA PMID:25781180 Detailed analysis of the human mitochondrial contact site co...	MODIFY	Summary: SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization. Reason: Use mitochondrial outer membrane rather than the broad parent term mitochondrion. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0042407 cristae formation	IMP PMID:22252321 Sam50 functions in mitochondrial intermembrane space bridgin...	KEEP AS NON CORE	Summary: SAMM50 perturbation affects cristae organization through SAM-MICOS/MIB contact sites. Reason: Cristae formation is a supported cellular architecture consequence, but the core SAMM50 function remains outer-membrane beta-barrel insertion. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0042407 cristae formation	IMP PMID:25781180 Detailed analysis of the human mitochondrial contact site co...	KEEP AS NON CORE	Summary: SAMM50 perturbation affects cristae organization through SAM-MICOS/MIB contact sites. Reason: Cristae formation is a supported cellular architecture consequence, but the core SAMM50 function remains outer-membrane beta-barrel insertion. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0005739 mitochondrion	HDA PMID:20833797 Phosphoproteome analysis of functional mitochondria isolated...	MODIFY	Summary: SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization. Reason: Use mitochondrial outer membrane rather than the broad parent term mitochondrion. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0070062 extracellular exosome	HDA PMID:19056867 Large-scale proteomics and phosphoproteomics of urinary exos...	REMOVE	Summary: The curated literature supports mitochondrial outer membrane localization and SAM complex function, not extracellular exosome localization. Reason: This high-throughput exosome annotation is not supported by gene-specific functional evidence for SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0016020 membrane	IDA PMID:15644312 Dissection of the mitochondrial import and assembly pathway ...	MODIFY	Summary: SAMM50 is a membrane protein, specifically a mitochondrial outer membrane beta-barrel protein. Reason: Use mitochondrial outer membrane rather than generic membrane. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005515 protein binding	IPI PMID:21081504 ChChd3, an inner mitochondrial membrane protein, is essentia...	MARK AS OVER ANNOTATED	Summary: SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding is less informative than its insertase and complex annotations. Reason: Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)
GO:0001401 SAM complex	IMP PMID:15644312 Dissection of the mitochondrial import and assembly pathway ...	ACCEPT	Summary: SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex. Reason: SAM complex membership is a core cellular component annotation for SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3)
GO:0005739 mitochondrion	IDA PMID:15644312 Dissection of the mitochondrial import and assembly pathway ...	MODIFY	Summary: SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization. Reason: Use mitochondrial outer membrane rather than the broad parent term mitochondrion. Proposed replacements: mitochondrial outer membrane Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0005741 mitochondrial outer membrane	IDA PMID:15644312 Dissection of the mitochondrial import and assembly pathway ...	ACCEPT	Summary: SAMM50 is an outer mitochondrial membrane Omp85-family beta-barrel protein. Reason: Outer mitochondrial membrane localization is central to SAMM50 topology and function. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
GO:0032977 membrane insertase activity	NAS file:human/SAMM50/SAMM50-deep-research-falcon.md	NEW	Summary: SAMM50 is the core Sam50/SAM50 membrane insertase subunit that inserts and assembles mitochondrial outer-membrane beta-barrel proteins. Reason: The current GOA captures the biological process and complex but lacks the precise molecular function membrane insertase activity for SAMM50. Supporting Evidence: file:human/SAMM50/SAMM50-deep-research-falcon.md The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3) file:human/SAMM50/SAMM50-deep-research-falcon.md Primary function: SAMM50 is the core insertase/chaperone of the SAM complex that assembles mitochondrial outer membrane β-barrel proteins (including Tom40 and VDACs) in an energy-independent manner. (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2) file:human/SAMM50/SAMM50-deep-research-falcon.md SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)

Core Functions

SAMM50 is the core Omp85-family membrane insertase of the mitochondrial SAM complex. It recognizes and assembles beta-barrel precursor proteins delivered by the TOM/IMS chaperone pathway and releases mature beta-barrels such as TOM40 and VDAC into the outer mitochondrial membrane.

Molecular Function:

membrane insertase activity

Directly Involved In:

protein insertion into mitochondrial outer membrane

Cellular Locations:

mitochondrial outer membrane

In Complex:

SAM complex

Supporting Evidence:

file:human/SAMM50/SAMM50-deep-research-falcon.md
The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3)
file:human/SAMM50/SAMM50-deep-research-falcon.md
**Primary function:** SAMM50 is the core insertase/chaperone of the SAM complex that assembles **mitochondrial outer membrane β-barrel proteins** (including **Tom40** and **VDACs**) in an **energy-independent** manner. (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)
file:human/SAMM50/SAMM50-deep-research-falcon.md
SAMM50/Sam50 is an **outer mitochondrial membrane (OMM)** protein. It is described as a **16-stranded transmembrane β-barrel** with a single N-terminal **POTRA** domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
file:human/SAMM50/SAMM50-deep-research-falcon.md
SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)

References

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

GO_REF:0000024

Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity

GO_REF:0000033

Annotation inferences using phylogenetic trees

GO_REF:0000044

Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt

GO_REF:0000052

Gene Ontology annotation based on curation of immunofluorescence data

PMID:15644312

Dissection of the mitochondrial import and assembly pathway for human Tom40.

PMID:17510655

Conserved roles of Sam50 and metaxins in VDAC biogenesis.

PMID:19056867

Large-scale proteomics and phosphoproteomics of urinary exosomes.

PMID:20833797

Phosphoproteome analysis of functional mitochondria isolated from resting human muscle reveals extensive phosphorylation of inner membrane protein complexes and enzymes.

PMID:21081504

ChChd3, an inner mitochondrial membrane protein, is essential for maintaining crista integrity and mitochondrial function.

PMID:22252321

Sam50 functions in mitochondrial intermembrane space bridging and biogenesis of respiratory complexes.

PMID:25416956

A proteome-scale map of the human interactome network.

PMID:25781180

Detailed analysis of the human mitochondrial contact site complex indicate a hierarchy of subunits.

PMID:26477565

Evolution and structural organization of the mitochondrial contact site (MICOS) complex and the mitochondrial intermembrane space bridging (MIB) complex.

PMID:27059175

SAMM50 Affects Mitochondrial Morphology through the Association of Drp1 in Mammalian Cells.

PMID:31387448

Mitochondria-hubs for regulating cellular biochemistry: emerging concepts and networks.

PMID:31644573

Armadillo repeat-containing protein 1 is a dual localization protein associated with mitochondrial intermembrane space bridging complex.

PMID:32296183

A reference map of the human binary protein interactome.

PMID:33961781

Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.

PMID:34800366

Quantitative high-confidence human mitochondrial proteome and its dynamics in cellular context.

file:human/SAMM50/SAMM50-deep-research-falcon.md

Falcon deep research on SAMM50 function

SAMM50 is the core Omp85-family beta-barrel subunit of the mitochondrial SAM complex.
SAMM50/SAM mediates insertion and assembly of mitochondrial outer-membrane beta-barrel proteins.
SAMM50 participates in SAM-MICOS/MIB contacts that affect cristae organization, but this is secondary to its core insertase role.

Suggested Experiments

Experiment: Reconstitute the human SAMM50-MTX SAM complex with purified human TOM40 or VDAC beta-barrel precursors and assay insertion intermediates, lateral-gate mutants, and beta-signal dependence.

Hypothesis: Human SAMM50 provides the core membrane insertase activity for outer-membrane beta-barrel substrate assembly.

Deep Research

Falcon

(SAMM50-deep-research-falcon.md)

Comprehensive research report: Human **SAMM50 / SAM50** (UniProt **Q9Y512**) — functional annotation Falcon Edison Scientific Literature 17 citations 2026-05-11T19:39:19.210275

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Comprehensive research report: Human SAMM50 / SAM50 (UniProt Q9Y512) — functional annotation

0) Mandatory identity verification (disambiguation)

The target in this report is human SAMM50 (UniProt Q9Y512), annotated as Sorting and assembly machinery component 50 homolog (also called SAM50; synonym TRG-3 / transformation-related gene 3) and belonging to the SAM50/Omp85 family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized below consistently describes Sam50/SAMM50 as the core β-barrel subunit of the mitochondrial Sorting and Assembly Machinery (SAM) complex, localized to the mitochondrial outer membrane (OMM) and functionally homologous to bacterial BamA (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)

1) Key concepts and definitions (current understanding)

1.1 What is the SAM complex?

The Sorting and Assembly Machinery (SAM) is the mitochondrial outer-membrane insertase required for insertion/assembly of β-barrel proteins into the OMM. Its core subunit Sam50 (SAMM50 in humans) is itself an Omp85-family β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory subunits are functionally replaced by metaxins. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3)

1.2 What are mitochondrial β-barrel proteins and why are they important?

Mitochondrial β-barrel proteins (e.g., Tom40 and VDAC) reside in the OMM, where they mediate metabolite exchange and/or serve as key import pores (Tom40) for nuclear-encoded mitochondrial proteins. Their correct insertion requires the TOM→SAM pathway. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand pages 1-3)

1.3 “β-signal”, lateral gate, and “β-barrel switching” (mechanistic vocabulary)

Recent review syntheses describe the following mechanistic framework:
- β-signal: a C-terminal signal in β-barrel precursors recognized by Sam50; Sam50 loop features (including a conserved IRGF-like motif in loop 6) participate in recognition and folding initiation. (ganesan2024biogenesisofmitochondrial pages 2-4, ravi2025mitochondrialsortingand pages 20-24)
- Lateral gate: the site at the Sam50 barrel “seam” (β1–β16) that can open laterally to allow β-strand insertion; Sam50 is described as not fully closed (no β1–β16 H-bonds in available structures), consistent with lateral gating. (ravi2025mitochondrialsortingand pages 20-24)
- β-barrel switching: a model in which β-strands of the precursor assemble at Sam50 to form a Sam50–preprotein hybrid barrel, then the nascent barrel is released into the OMM via displacement/switching. (ganesan2024biogenesisofmitochondrial pages 1-2)

2) Molecular function and mechanism (experimental + inference)

2.1 Subcellular localization and topology

SAMM50/Sam50 is an outer mitochondrial membrane (OMM) protein. It is described as a 16-stranded transmembrane β-barrel with a single N-terminal POTRA domain. In mitochondria, the POTRA domain is positioned to participate in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)

2.2 Core function: insertion/assembly of OMM β-barrel proteins

Primary function: SAMM50 is the core insertase/chaperone of the SAM complex that assembles mitochondrial outer membrane β-barrel proteins (including Tom40 and VDACs) in an energy-independent manner. (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)

Import/assembly pathway (current consensus):
1. Precursor β-barrel proteins are synthesized in the cytosol and targeted to mitochondria.
2. They are translocated across the OMM by the TOM complex into the intermembrane space (IMS).
3. IMS chaperones (small Tims, e.g., Tim9/10 or Tim8/13) prevent aggregation and deliver precursors to SAM.
4. SAM (via Sam50/SAMM50) inserts/assembles the β-barrel in the OMM, with models emphasizing β-signal recognition, lateral gating, and β-barrel switching as key mechanistic steps. (ganesan2024biogenesisofmitochondrial pages 1-2, ganesan2024biogenesisofmitochondrial pages 2-4)

2.3 Key binding partners and multi-complex organization

Accessory SAM partners in mammals: Mammalian SAM is described as using metaxins (MTX1/MTX2) as functional analogs of yeast Sam35/Sam37 on the cytosolic face of Sam50, consistent with the conserved cytosolic loop interaction surfaces on Sam50. (ravi2025mitochondrialsortingand pages 16-17, ravi2025mitochondrialsortingand pages 20-24)

TOM–SAM coupling: SAM forms TOM–SAM supercomplexes that couple translocation through TOM to assembly by SAM, supporting efficient β-barrel biogenesis. (ganesan2024biogenesisofmitochondrial pages 1-2, ganesan2024biogenesisofmitochondrial media a6c2469b)

SAM–MICOS contact site / MIB axis (cristae junction biology): SAM is also described as an interaction hub forming a defined outer–inner membrane contact with MICOS, notably via interaction between Sam50 and MICOS subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to cristae organization and mitochondrial architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)

ER–mitochondria contacts and lipid transfer: Review synthesis also connects Sam50/SAMM50 with ER proteins ORP5/ORP8 at ER–mitochondria contact sites (MERCS), proposing a structural/functional contribution to phospholipid transfer (e.g., PS→PE conversion pathways) that can indirectly impact inner-membrane structure and cristae. (ravi2025mitochondrialsortingand pages 30-35, ravi2025mitochondrialsortingand pages 1-3)

3) Recent developments (prioritizing 2023–2024)

3.1 2024 review synthesis: β-barrel biogenesis and SAM as a multi-pathway hub

A 2024 FEBS Open Bio review emphasizes that SAM is required for β-barrel insertion, describes the Sam50 lateral gate and β-barrel switching mechanism, and highlights that SAM forms TOM–SAM supercomplexes and contacts MICOS, placing SAMM50 at the intersection of protein import, membrane contact-site biology, and mitochondrial architecture. (Publication date: Sep 2024; https://doi.org/10.1002/2211-5463.13905) (ganesan2024biogenesisofmitochondrial pages 1-2)

Visual evidence (mechanism and connectivity): The same review includes schematics of (i) β-barrel switching and (ii) TOM–SAM and SAM–MICOS contact-site architecture. (ganesan2024biogenesisofmitochondrial media 50bb168a, ganesan2024biogenesisofmitochondrial media a6c2469b)

3.2 2024 human genetics: SAMM50 variants associated with NAFLD risk and fibrosis proxy

A 2023 community-based case–control study in an elderly Chinese cohort (n=1,053; 590 NAFLD cases) reported associations between SAMM50 variants and NAFLD risk:
- rs2073082 G: NAFLD risk OR 1.962 (95% CI 1.448–2.659; p<0.001)
- rs738491 T: NAFLD risk OR 1.532 (95% CI 1.246–1.884; p=0.021)
The study also reported increased liver stiffness measurement (LSM) in carriers of rs738491 T and rs3761472 G, and found that a three-SNP interaction model (rs2073082/rs738491/rs3761472) had the best NAFLD predictive performance in their GMDR analysis. (Publication date: Aug 2023; https://doi.org/10.3390/biomedicines11092416) (zhao2023samm50rs2073082rs738491and pages 2-4, zhao2023samm50rs2073082rs738491and pages 1-2)

3.3 2023–2024 disease/phenotype landscape (knowledge graph summary)

Open Targets aggregates genetic/functional evidence linking SAMM50 to liver disease/NAFLD, type 2 diabetes mellitus, hypercholesterolemia, and neurodegenerative disease (association-level summaries rather than mechanistic proof). (OpenTargets Search: -SAMM50)

4) Current applications and real-world implementations

4.1 Variant interpretation and genetic risk modeling in steatotic liver disease

The 2023 NAFLD study demonstrates a direct clinical-genetic application: SAMM50 SNPs can contribute to risk stratification and multi-locus predictive models for NAFLD in specific populations/age groups, with effect sizes in the ~1.5–2.0 OR range for the highlighted alleles in their cohort. (zhao2023samm50rs2073082rs738491and pages 1-2)

4.2 Functional genomics and mitochondrial biology toolchains

Because SAMM50 is central to β-barrel biogenesis and a contact-site hub (TOM–SAM, SAM–MICOS), it is routinely used in:
- Mitochondrial import/assembly assays (tracking TOM→SAM assembly of Tom40/VDAC) and perturbation experiments to link β-barrel insertion defects to OMM proteostasis.
- Cristae architecture studies, leveraging the SAM–MICOS link to test how outer-membrane machineries influence inner-membrane ultrastructure and respiratory complex organization. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)

4.3 Translational concepts: targeting mitochondrial organization rather than a catalytic activity

SAMM50 is not an enzyme with a specific substrate turnover reaction; it is a membrane insertase/chaperone and organizational hub. Thus translational strategies tend to focus on:
- Correcting upstream drivers (e.g., metabolic stress) that dysregulate SAMM50-linked pathways.
- Interpreting SAMM50 variation as part of polygenic or pathway-level risk rather than targeting SAMM50 directly with inhibitors. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)

5) Expert opinion and analysis (authoritative synthesis)

5.1 SAM/Sam50 as more than a β-barrel insertase

A 2025 Biochemistry review (useful as expert synthesis, though outside the requested 2023–2024 window) argues that although β-barrel assembly is the canonical function, Sam50/SAMM50 participates broadly in OMM interactomes that connect protein biogenesis to cristae morphology (via MICOS), lipid exchange at contact sites (via ORP5/8), and mitophagy regulation (via PINK1). This framing helps interpret why SAMM50 perturbations can have pleiotropic effects that still trace back to its primary role in OMM organization and β-barrel biogenesis. (Publication date: Jan 2025; https://doi.org/10.1021/acs.biochem.4c00727) (ravi2025mitochondrialsortingand pages 30-35)

5.2 Mechanistic caution: association vs causality in human disease

While common variants in SAMM50 associate with NAFLD risk in specific cohorts (and Open Targets aggregates broader disease associations), these do not by themselves establish SAMM50 as a monogenic disease gene with a well-defined pathogenic mechanism in humans. Current evidence supports SAMM50 as an essential mitochondrial organization factor; complete loss is plausibly incompatible with viability, and disease links may often be mediated through partial changes in expression/function in metabolic stress contexts. (ravi2025mitochondrialsortingand pages 13-15, zhao2023samm50rs2073082rs738491and pages 1-2)

6) Relevant statistics and data highlights (recent studies)

NAFLD cohort size and prevalence: 1,053 elderly participants; 590 NAFLD cases (56.03%). (zhao2023samm50rs2073082rs738491and pages 4-5)
Effect sizes for SAMM50 alleles (NAFLD risk): rs2073082 G: OR 1.962; rs738491 T: OR 1.532. (zhao2023samm50rs2073082rs738491and pages 1-2)
Fibrosis proxy association: rs738491 T and rs3761472 G associated with increased liver stiffness measurement (LSM) in the cohort. (zhao2023samm50rs2073082rs738491and pages 1-2)

7) Concise functional annotation (summary)

SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a mitochondrial outer membrane Omp85-family β-barrel insertase and the core subunit of the SAM complex. Its primary, experimentally grounded role is the assembly/insertion of OMM β-barrel proteins (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via β-signal recognition, lateral gating, and β-barrel switching. SAMM50 also serves as an organizational hub by forming TOM–SAM supercomplexes and participating in SAM–MICOS contact sites that connect outer-membrane protein biogenesis to cristae junction organization. In human populations, common SAMM50 variants show reproducible associations with NAFLD risk in some cohorts, supporting a role for mitochondrial membrane architecture pathways in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and pages 1-2)

Evidence table (quick reference)

Aspect	Concise finding for human SAMM50 (UniProt Q9Y512)	Supporting citations
Verified identity / synonyms	SAMM50 encodes human sorting and assembly machinery component 50 homolog (SAM50), also called TRG-3 / transformation-related gene 3 protein; it is the conserved human Omp85-family core subunit of the mitochondrial SAM complex in the outer membrane.	(ravi2025mitochondrialsortingand pages 1-3)
Protein family / domains / topology	SAMM50 belongs to the SAM50/Omp85 family and is a 16-stranded β-barrel outer-membrane protein with a single N-terminal POTRA domain; available structural summaries indicate a non-closed barrel seam between β1 and β16 consistent with a lateral gate, and loop L6 contains the conserved (V/I)RG(F/Y) motif involved in substrate handling.	(ravi2025mitochondrialsortingand pages 20-24, ganesan2024biogenesisofmitochondrial pages 2-4)
Subcellular localization	SAMM50 localizes to the mitochondrial outer membrane (OMM), with the POTRA domain exposed to the intermembrane space and cytosolic surfaces engaging accessory factors; it also participates in outer–inner membrane contact sites with MICOS and at ER–mitochondria contact sites.	(ravi2025mitochondrialsortingand pages 35-36, ganesan2024biogenesisofmitochondrial pages 1-2, ganesan2024biogenesisofmitochondrial media 50bb168a)
Core molecular function / mechanism	Canonical function: assembly/insertion of mitochondrial β-barrel proteins such as Tom40 and VDACs. Precursor route is cytosol → TOM complex → IMS small Tim chaperones (Tim9/10 or Tim8/13) → SAM complex. Mechanistically, the precursor β-signal engages Sam50, insertion occurs at the lateral gate, and current models favor β-barrel switching, where a nascent barrel forms a Sam50–preprotein hybrid barrel before release into the OMM.	(ganesan2024biogenesisofmitochondrial pages 1-2, ganesan2024biogenesisofmitochondrial pages 2-4, ravi2025mitochondrialsortingand pages 7-8)
Key complexes / partners	SAMM50 is the central subunit of the SAM complex; in humans, metaxins MTX1/MTX2 replace yeast Sam35/37-like accessory functions. It functionally couples with the TOM complex, forms a SAM–MICOS / MIB axis with Mic60/Mic19 for cristae organization, and associates with ORP5/ORP8 at ER–mitochondria contact sites to support lipid transfer.	(ravi2025mitochondrialsortingand pages 16-17, ravi2025mitochondrialsortingand pages 8-10, ravi2025mitochondrialsortingand pages 1-3)
Phenotypes when perturbed	SAMM50 loss/depletion disrupts β-barrel biogenesis, causes cristae loss/disorganization, abnormal spherical/enlarged mitochondria, loss of respiratory complexes, altered lipid homeostasis, and PINK1 stabilization with increased PINK1–Parkin mitophagy; the review literature also notes that complete loss is likely lethal/essential.	(ravi2025mitochondrialsortingand pages 8-10, ravi2025mitochondrialsortingand pages 30-35, ravi2025mitochondrialsortingand pages 1-3)
2023–2024 human genetics associations	In an elderly Chinese cohort of 1,053 individuals (590 NAFLD cases), SAMM50 rs2073082 G was associated with higher NAFLD risk (OR 1.962, 95% CI 1.448–2.659, p<0.001) and rs738491 T with higher NAFLD risk (OR 1.532, 95% CI 1.246–1.884, p=0.021). rs738491 T and rs3761472 G were associated with higher liver stiffness, and the three-SNP model (rs2073082/rs738491/rs3761472) gave the best NAFLD prediction, with carriers of all three risk alleles showing roughly two-fold higher risk. Open Targets also summarizes associations of SAMM50 with liver disease/NAFLD.	(zhao2023samm50rs2073082rs738491and pages 1-2, zhao2023samm50rs2073082rs738491and pages 4-5, OpenTargets Search: -SAMM50)

Table: This table summarizes the verified identity, structure, localization, mechanism, interaction partners, perturbation phenotypes, and recent human genetic associations for human SAMM50. It is useful as a compact evidence-backed reference for functional annotation of UniProt Q9Y512.

Key URLs (most used sources)

Ganesan et al., “Biogenesis of mitochondrial β‐barrel membrane proteins”, FEBS Open Bio, Sep 2024. https://doi.org/10.1002/2211-5463.13905 (ganesan2024biogenesisofmitochondrial pages 1-2)
Zhao et al., “SAMM50-rs2073082, -rs738491 and -rs3761472 interactions…”, Biomedicines, Aug 2023. https://doi.org/10.3390/biomedicines11092416 (zhao2023samm50rs2073082rs738491and pages 1-2)
Open Targets association summary for SAMM50 (accessed via Open Targets tool output in this run). https://platform.opentargets.org/ (OpenTargets Search: -SAMM50)

References

(ravi2025mitochondrialsortingand pages 1-3): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.
(ganesan2024biogenesisofmitochondrial pages 1-2): Iniyan Ganesan, Jon V. Busto, Nikolaus Pfanner, and Nils Wiedemann. Biogenesis of mitochondrial β‐barrel membrane proteins. FEBS Open Bio, 14:1595-1609, Sep 2024. URL: https://doi.org/10.1002/2211-5463.13905, doi:10.1002/2211-5463.13905. This article has 20 citations and is from a peer-reviewed journal.
(ganesan2024biogenesisofmitochondrial pages 2-4): Iniyan Ganesan, Jon V. Busto, Nikolaus Pfanner, and Nils Wiedemann. Biogenesis of mitochondrial β‐barrel membrane proteins. FEBS Open Bio, 14:1595-1609, Sep 2024. URL: https://doi.org/10.1002/2211-5463.13905, doi:10.1002/2211-5463.13905. This article has 20 citations and is from a peer-reviewed journal.
(ravi2025mitochondrialsortingand pages 20-24): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.
(ravi2025mitochondrialsortingand pages 16-17): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.
(ganesan2024biogenesisofmitochondrial media a6c2469b): Iniyan Ganesan, Jon V. Busto, Nikolaus Pfanner, and Nils Wiedemann. Biogenesis of mitochondrial β‐barrel membrane proteins. FEBS Open Bio, 14:1595-1609, Sep 2024. URL: https://doi.org/10.1002/2211-5463.13905, doi:10.1002/2211-5463.13905. This article has 20 citations and is from a peer-reviewed journal.
(ravi2025mitochondrialsortingand pages 8-10): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.
(ravi2025mitochondrialsortingand pages 30-35): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.
(ganesan2024biogenesisofmitochondrial media 50bb168a): Iniyan Ganesan, Jon V. Busto, Nikolaus Pfanner, and Nils Wiedemann. Biogenesis of mitochondrial β‐barrel membrane proteins. FEBS Open Bio, 14:1595-1609, Sep 2024. URL: https://doi.org/10.1002/2211-5463.13905, doi:10.1002/2211-5463.13905. This article has 20 citations and is from a peer-reviewed journal.
(zhao2023samm50rs2073082rs738491and pages 2-4): Jinhan Zhao, Xiaoyi Xu, Xinhuan Wei, Shuang Zhang, Hangfei Xu, Xiaodie Wei, Yang Zhang, and Jing Zhang. Samm50-rs2073082, -rs738491 and -rs3761472 interactions enhancement of susceptibility to non-alcoholic fatty liver disease. Biomedicines, 11:2416, Aug 2023. URL: https://doi.org/10.3390/biomedicines11092416, doi:10.3390/biomedicines11092416. This article has 5 citations.
(zhao2023samm50rs2073082rs738491and pages 1-2): Jinhan Zhao, Xiaoyi Xu, Xinhuan Wei, Shuang Zhang, Hangfei Xu, Xiaodie Wei, Yang Zhang, and Jing Zhang. Samm50-rs2073082, -rs738491 and -rs3761472 interactions enhancement of susceptibility to non-alcoholic fatty liver disease. Biomedicines, 11:2416, Aug 2023. URL: https://doi.org/10.3390/biomedicines11092416, doi:10.3390/biomedicines11092416. This article has 5 citations.
(OpenTargets Search: -SAMM50): Open Targets Query (-SAMM50, 5 results). Buniello, A. et al. (2025). Open Targets Platform: facilitating therapeutic hypotheses building in drug discovery. Nucleic Acids Research.
(ravi2025mitochondrialsortingand pages 13-15): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.
(zhao2023samm50rs2073082rs738491and pages 4-5): Jinhan Zhao, Xiaoyi Xu, Xinhuan Wei, Shuang Zhang, Hangfei Xu, Xiaodie Wei, Yang Zhang, and Jing Zhang. Samm50-rs2073082, -rs738491 and -rs3761472 interactions enhancement of susceptibility to non-alcoholic fatty liver disease. Biomedicines, 11:2416, Aug 2023. URL: https://doi.org/10.3390/biomedicines11092416, doi:10.3390/biomedicines11092416. This article has 5 citations.
(ravi2025mitochondrialsortingand pages 35-36): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.
(ravi2025mitochondrialsortingand pages 7-8): Roshika Ravi, Deepsikha Routray, and Radhakrishnan Mahalakshmi. Mitochondrial sorting and assembly machinery: chaperoning a moonlighting role? Biochemistry, 64:312-328, Jan 2025. URL: https://doi.org/10.1021/acs.biochem.4c00727, doi:10.1021/acs.biochem.4c00727. This article has 4 citations and is from a peer-reviewed journal.

Citations

ravi2025mitochondrialsortingand pages 20-24
ganesan2024biogenesisofmitochondrial pages 1-2
ravi2025mitochondrialsortingand pages 30-35
ravi2025mitochondrialsortingand pages 1-3
ganesan2024biogenesisofmitochondrial pages 2-4
ravi2025mitochondrialsortingand pages 16-17
ravi2025mitochondrialsortingand pages 8-10
ravi2025mitochondrialsortingand pages 13-15
ravi2025mitochondrialsortingand pages 35-36
ravi2025mitochondrialsortingand pages 7-8
https://doi.org/10.1002/2211-5463.13905
https://doi.org/10.3390/biomedicines11092416
https://doi.org/10.1021/acs.biochem.4c00727
https://platform.opentargets.org/
https://doi.org/10.1021/acs.biochem.4c00727,
https://doi.org/10.1002/2211-5463.13905,
https://doi.org/10.3390/biomedicines11092416,

📄 View Raw YAML

id: Q9Y512
gene_symbol: SAMM50
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: >-
  SAMM50 encodes the human Sam50/SAM50 Omp85-family beta-barrel subunit of the mitochondrial sorting and assembly machinery
  (SAM) complex. It is an outer mitochondrial membrane insertase for beta-barrel proteins such as TOM40 and VDACs
  and also participates in SAM-MICOS/MIB contact sites that link outer-membrane beta-barrel biogenesis to cristae organization.
existing_annotations:
  - term:
      id: GO:0001401
      label: SAM complex
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: >-
        SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex.
      action: ACCEPT
      reason: >-
        SAM complex membership is a core cellular component annotation for SAMM50.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The target in this report is **human SAMM50** (UniProt **Q9Y512**), annotated as **Sorting and assembly machinery
            component 50 homolog** (also called **SAM50**; synonym **TRG-3 / transformation-related gene 3**) and belonging
            to the **SAM50/Omp85** family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized
            below consistently describes **Sam50/SAMM50** as the **core β-barrel subunit of the mitochondrial Sorting and
            Assembly Machinery (SAM) complex**, localized to the **mitochondrial outer membrane (OMM)** and functionally homologous
            to bacterial **BamA** (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial
            pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly
            of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family
            β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the
            accessory subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2,
            ravi2025mitochondrialsortingand pages 1-3)
  - term:
      id: GO:0045040
      label: protein insertion into mitochondrial outer membrane
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: >-
        SAMM50/SAM inserts and assembles mitochondrial outer-membrane beta-barrel proteins such as TOM40 and VDAC.
      action: ACCEPT
      reason: >-
        Protein insertion into the mitochondrial outer membrane captures the central biological process of SAMM50.
      supported_by: &id002
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly
            of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family
            β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the
            accessory subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2,
            ravi2025mitochondrialsortingand pages 1-3)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **Primary function:** SAMM50 is the core insertase/chaperone of the SAM complex that assembles **mitochondrial
            outer membrane β-barrel proteins** (including **Tom40** and **VDACs**) in an **energy-independent** manner. (ravi2025mitochondrialsortingand
            pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: >-
        SAMM50 is an outer mitochondrial membrane beta-barrel protein, not a cytoplasmic protein.
      action: REMOVE
      reason: >-
        The cytoplasm annotation conflicts with the curated outer mitochondrial membrane localization and likely reflects
        a broad or transferred location call.
      supported_by: &id001
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The target in this report is **human SAMM50** (UniProt **Q9Y512**), annotated as **Sorting and assembly machinery
            component 50 homolog** (also called **SAM50**; synonym **TRG-3 / transformation-related gene 3**) and belonging
            to the **SAM50/Omp85** family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized
            below consistently describes **Sam50/SAMM50** as the **core β-barrel subunit of the mitochondrial Sorting and
            Assembly Machinery (SAM) complex**, localized to the **mitochondrial outer membrane (OMM)** and functionally homologous
            to bacterial **BamA** (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial
            pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50/Sam50 is an **outer mitochondrial membrane (OMM)** protein. It is described as a **16-stranded transmembrane
            β-barrel** with a single N-terminal **POTRA** domain. In mitochondria, the POTRA domain is positioned to participate
            in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand
            pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: >-
        SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization.
      action: MODIFY
      reason: >-
        Use mitochondrial outer membrane rather than the broad parent term mitochondrion.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0005741
      label: mitochondrial outer membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: >-
        SAMM50 is an outer mitochondrial membrane Omp85-family beta-barrel protein.
      action: ACCEPT
      reason: >-
        Outer mitochondrial membrane localization is central to SAMM50 topology and function.
      supported_by: *id001
  - term:
      id: GO:0019867
      label: outer membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: >-
        SAMM50 is in an outer membrane, specifically the mitochondrial outer membrane.
      action: MODIFY
      reason: >-
        The taxon/gene-specific evidence supports mitochondrial outer membrane as the precise location.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:25416956
    review:
      summary: >-
        SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding
        is less informative than its insertase and complex annotations.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **SAM–MICOS contact site / MIB axis (cristae junction biology):** SAM is also described as an interaction hub
            forming a defined **outer–inner membrane contact** with **MICOS**, notably via interaction between Sam50 and MICOS
            subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to **cristae organization** and mitochondrial
            architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:27059175
    review:
      summary: >-
        SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding
        is less informative than its insertase and complex annotations.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **SAM–MICOS contact site / MIB axis (cristae junction biology):** SAM is also described as an interaction hub
            forming a defined **outer–inner membrane contact** with **MICOS**, notably via interaction between Sam50 and MICOS
            subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to **cristae organization** and mitochondrial
            architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:32296183
    review:
      summary: >-
        SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding
        is less informative than its insertase and complex annotations.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **SAM–MICOS contact site / MIB axis (cristae junction biology):** SAM is also described as an interaction hub
            forming a defined **outer–inner membrane contact** with **MICOS**, notably via interaction between Sam50 and MICOS
            subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to **cristae organization** and mitochondrial
            architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:33961781
    review:
      summary: >-
        SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding
        is less informative than its insertase and complex annotations.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **SAM–MICOS contact site / MIB axis (cristae junction biology):** SAM is also described as an interaction hub
            forming a defined **outer–inner membrane contact** with **MICOS**, notably via interaction between Sam50 and MICOS
            subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to **cristae organization** and mitochondrial
            architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: >-
        SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization.
      action: MODIFY
      reason: >-
        Use mitochondrial outer membrane rather than the broad parent term mitochondrion.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: >-
        SAMM50 is an outer mitochondrial membrane beta-barrel protein, not a cytoplasmic protein.
      action: REMOVE
      reason: >-
        The cytoplasm annotation conflicts with the curated outer mitochondrial membrane localization and likely reflects
        a broad or transferred location call.
      supported_by: *id001
  - term:
      id: GO:0001401
      label: SAM complex
    evidence_type: IPI
    original_reference_id: PMID:17510655
    review:
      summary: >-
        SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex.
      action: ACCEPT
      reason: >-
        SAM complex membership is a core cellular component annotation for SAMM50.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The target in this report is **human SAMM50** (UniProt **Q9Y512**), annotated as **Sorting and assembly machinery
            component 50 homolog** (also called **SAM50**; synonym **TRG-3 / transformation-related gene 3**) and belonging
            to the **SAM50/Omp85** family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized
            below consistently describes **Sam50/SAMM50** as the **core β-barrel subunit of the mitochondrial Sorting and
            Assembly Machinery (SAM) complex**, localized to the **mitochondrial outer membrane (OMM)** and functionally homologous
            to bacterial **BamA** (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial
            pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly
            of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family
            β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the
            accessory subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2,
            ravi2025mitochondrialsortingand pages 1-3)
  - term:
      id: GO:0005741
      label: mitochondrial outer membrane
    evidence_type: NAS
    original_reference_id: PMID:31387448
    review:
      summary: >-
        SAMM50 is an outer mitochondrial membrane Omp85-family beta-barrel protein.
      action: ACCEPT
      reason: >-
        Outer mitochondrial membrane localization is central to SAMM50 topology and function.
      supported_by: *id001
  - term:
      id: GO:0045040
      label: protein insertion into mitochondrial outer membrane
    evidence_type: NAS
    original_reference_id: PMID:31387448
    review:
      summary: >-
        SAMM50/SAM inserts and assembles mitochondrial outer-membrane beta-barrel proteins such as TOM40 and VDAC.
      action: ACCEPT
      reason: >-
        Protein insertion into the mitochondrial outer membrane captures the central biological process of SAMM50.
      supported_by: *id002
  - term:
      id: GO:0030150
      label: protein import into mitochondrial matrix
    evidence_type: IDA
    original_reference_id: PMID:15644312
    review:
      summary: >-
        SAMM50 handles outer-membrane beta-barrel substrates after TOM translocation, not matrix-targeted presequence import
        through TIM23.
      action: MODIFY
      reason: >-
        The original Tom40 pathway evidence is better captured by protein insertion into mitochondrial outer membrane.
      proposed_replacement_terms:
        - id: GO:0045040
          label: protein insertion into mitochondrial outer membrane
      supported_by: *id002
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: HTP
    original_reference_id: PMID:34800366
    review:
      summary: >-
        SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization.
      action: MODIFY
      reason: >-
        Use mitochondrial outer membrane rather than the broad parent term mitochondrion.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:31644573
    review:
      summary: >-
        SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding
        is less informative than its insertase and complex annotations.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **SAM–MICOS contact site / MIB axis (cristae junction biology):** SAM is also described as an interaction hub
            forming a defined **outer–inner membrane contact** with **MICOS**, notably via interaction between Sam50 and MICOS
            subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to **cristae organization** and mitochondrial
            architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
  - term:
      id: GO:0001401
      label: SAM complex
    evidence_type: HDA
    original_reference_id: PMID:26477565
    review:
      summary: >-
        SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex.
      action: ACCEPT
      reason: >-
        SAM complex membership is a core cellular component annotation for SAMM50.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The target in this report is **human SAMM50** (UniProt **Q9Y512**), annotated as **Sorting and assembly machinery
            component 50 homolog** (also called **SAM50**; synonym **TRG-3 / transformation-related gene 3**) and belonging
            to the **SAM50/Omp85** family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized
            below consistently describes **Sam50/SAMM50** as the **core β-barrel subunit of the mitochondrial Sorting and
            Assembly Machinery (SAM) complex**, localized to the **mitochondrial outer membrane (OMM)** and functionally homologous
            to bacterial **BamA** (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial
            pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly
            of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family
            β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the
            accessory subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2,
            ravi2025mitochondrialsortingand pages 1-3)
  - term:
      id: GO:0007007
      label: inner mitochondrial membrane organization
    evidence_type: IC
    original_reference_id: PMID:26477565
    review:
      summary: >-
        SAMM50 contributes to inner-membrane/cristae architecture through SAM-MICOS/MIB contact sites, but this is secondary
        to its core SAM insertase role.
      action: KEEP_AS_NON_CORE
      reason: >-
        The annotation is supported as a downstream organizational role of the MIB/SAM-MICOS axis rather than the primary
        evolved molecular function.
      supported_by: &id003
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **SAM–MICOS contact site / MIB axis (cristae junction biology):** SAM is also described as an interaction hub
            forming a defined **outer–inner membrane contact** with **MICOS**, notably via interaction between Sam50 and MICOS
            subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to **cristae organization** and mitochondrial
            architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
  - term:
      id: GO:0140275
      label: MIB complex
    evidence_type: HDA
    original_reference_id: PMID:26477565
    review:
      summary: >-
        SAMM50 participates in the mitochondrial intermembrane-space bridging (MIB) complex/contact-site axis with MICOS components.
      action: KEEP_AS_NON_CORE
      reason: >-
        MIB complex association is supported but is treated as a contact-site/architecture role secondary to SAM beta-barrel
        insertion.
      supported_by: *id003
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: IDA
    original_reference_id: PMID:25781180
    review:
      summary: >-
        SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization.
      action: MODIFY
      reason: >-
        Use mitochondrial outer membrane rather than the broad parent term mitochondrion.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0042407
      label: cristae formation
    evidence_type: IMP
    original_reference_id: PMID:22252321
    review:
      summary: >-
        SAMM50 perturbation affects cristae organization through SAM-MICOS/MIB contact sites.
      action: KEEP_AS_NON_CORE
      reason: >-
        Cristae formation is a supported cellular architecture consequence, but the core SAMM50 function remains outer-membrane
        beta-barrel insertion.
      supported_by: *id003
  - term:
      id: GO:0042407
      label: cristae formation
    evidence_type: IMP
    original_reference_id: PMID:25781180
    review:
      summary: >-
        SAMM50 perturbation affects cristae organization through SAM-MICOS/MIB contact sites.
      action: KEEP_AS_NON_CORE
      reason: >-
        Cristae formation is a supported cellular architecture consequence, but the core SAMM50 function remains outer-membrane
        beta-barrel insertion.
      supported_by: *id003
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: HDA
    original_reference_id: PMID:20833797
    review:
      summary: >-
        SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization.
      action: MODIFY
      reason: >-
        Use mitochondrial outer membrane rather than the broad parent term mitochondrion.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0070062
      label: extracellular exosome
    evidence_type: HDA
    original_reference_id: PMID:19056867
    review:
      summary: >-
        The curated literature supports mitochondrial outer membrane localization and SAM complex function, not extracellular
        exosome localization.
      action: REMOVE
      reason: >-
        This high-throughput exosome annotation is not supported by gene-specific functional evidence for SAMM50.
      supported_by: *id001
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IDA
    original_reference_id: PMID:15644312
    review:
      summary: >-
        SAMM50 is a membrane protein, specifically a mitochondrial outer membrane beta-barrel protein.
      action: MODIFY
      reason: >-
        Use mitochondrial outer membrane rather than generic membrane.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21081504
    review:
      summary: >-
        SAMM50 has many physical partners in SAM, TOM, MICOS/MIB, and contact-site assemblies, but generic protein binding
        is less informative than its insertase and complex annotations.
      action: MARK_AS_OVER_ANNOTATED
      reason: >-
        Retain specific SAM complex, MIB/contact-site, and membrane insertase annotations rather than broad protein binding.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **SAM–MICOS contact site / MIB axis (cristae junction biology):** SAM is also described as an interaction hub
            forming a defined **outer–inner membrane contact** with **MICOS**, notably via interaction between Sam50 and MICOS
            subunits (e.g., Mic60/Mic19), thereby linking β-barrel biogenesis to **cristae organization** and mitochondrial
            architecture. (ravi2025mitochondrialsortingand pages 8-10, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
  - term:
      id: GO:0001401
      label: SAM complex
    evidence_type: IMP
    original_reference_id: PMID:15644312
    review:
      summary: >-
        SAMM50 is the conserved core beta-barrel subunit of the mitochondrial SAM complex.
      action: ACCEPT
      reason: >-
        SAM complex membership is a core cellular component annotation for SAMM50.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The target in this report is **human SAMM50** (UniProt **Q9Y512**), annotated as **Sorting and assembly machinery
            component 50 homolog** (also called **SAM50**; synonym **TRG-3 / transformation-related gene 3**) and belonging
            to the **SAM50/Omp85** family that mediates mitochondrial outer-membrane β-barrel biogenesis. The literature summarized
            below consistently describes **Sam50/SAMM50** as the **core β-barrel subunit of the mitochondrial Sorting and
            Assembly Machinery (SAM) complex**, localized to the **mitochondrial outer membrane (OMM)** and functionally homologous
            to bacterial **BamA** (Omp85 family). (ravi2025mitochondrialsortingand pages 1-3, ganesan2024biogenesisofmitochondrial
            pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly
            of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family
            β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the
            accessory subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2,
            ravi2025mitochondrialsortingand pages 1-3)
  - term:
      id: GO:0005739
      label: mitochondrion
    evidence_type: IDA
    original_reference_id: PMID:15644312
    review:
      summary: >-
        SAMM50 is mitochondrial, but the literature supports the more specific outer mitochondrial membrane localization.
      action: MODIFY
      reason: >-
        Use mitochondrial outer membrane rather than the broad parent term mitochondrion.
      proposed_replacement_terms:
        - id: GO:0005741
          label: mitochondrial outer membrane
      supported_by: *id001
  - term:
      id: GO:0005741
      label: mitochondrial outer membrane
    evidence_type: IDA
    original_reference_id: PMID:15644312
    review:
      summary: >-
        SAMM50 is an outer mitochondrial membrane Omp85-family beta-barrel protein.
      action: ACCEPT
      reason: >-
        Outer mitochondrial membrane localization is central to SAMM50 topology and function.
      supported_by: *id001
  - term:
      id: GO:0032977
      label: membrane insertase activity
    evidence_type: NAS
    original_reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
    review:
      summary: >-
        SAMM50 is the core Sam50/SAM50 membrane insertase subunit that inserts and assembles mitochondrial outer-membrane
        beta-barrel proteins.
      action: NEW
      reason: >-
        The current GOA captures the biological process and complex but lacks the precise molecular function membrane insertase
        activity for SAMM50.
      supported_by:
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly
            of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family
            β-barrel protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the
            accessory subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2,
            ravi2025mitochondrialsortingand pages 1-3)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            **Primary function:** SAMM50 is the core insertase/chaperone of the SAM complex that assembles **mitochondrial
            outer membrane β-barrel proteins** (including **Tom40** and **VDACs**) in an **energy-independent** manner. (ravi2025mitochondrialsortingand
            pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)
        - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
          supporting_text: >-
            SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and
            the **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion
            of OMM β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled
            via **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
            hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
            protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
            associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
            in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
            pages 1-2)
references:
  - id: GO_REF:0000002
    title: Gene Ontology annotation through association of InterPro records with GO terms
    findings: []
  - id: GO_REF:0000024
    title: Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of
      sequence similarity
    findings: []
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings: []
  - id: GO_REF:0000044
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied
      by conservative changes to GO terms applied by UniProt
    findings: []
  - id: GO_REF:0000052
    title: Gene Ontology annotation based on curation of immunofluorescence data
    findings: []
  - id: PMID:15644312
    title: Dissection of the mitochondrial import and assembly pathway for human Tom40.
    findings: []
  - id: PMID:17510655
    title: Conserved roles of Sam50 and metaxins in VDAC biogenesis.
    findings: []
  - id: PMID:19056867
    title: Large-scale proteomics and phosphoproteomics of urinary exosomes.
    findings: []
  - id: PMID:20833797
    title: Phosphoproteome analysis of functional mitochondria isolated from resting human muscle reveals extensive
      phosphorylation of inner membrane protein complexes and enzymes.
    findings: []
  - id: PMID:21081504
    title: ChChd3, an inner mitochondrial membrane protein, is essential for maintaining crista integrity and
      mitochondrial function.
    findings: []
  - id: PMID:22252321
    title: Sam50 functions in mitochondrial intermembrane space bridging and biogenesis of respiratory complexes.
    findings: []
  - id: PMID:25416956
    title: A proteome-scale map of the human interactome network.
    findings: []
  - id: PMID:25781180
    title: Detailed analysis of the human mitochondrial contact site complex indicate a hierarchy of subunits.
    findings: []
  - id: PMID:26477565
    title: Evolution and structural organization of the mitochondrial contact site (MICOS) complex and the mitochondrial
      intermembrane space bridging (MIB) complex.
    findings: []
  - id: PMID:27059175
    title: SAMM50 Affects Mitochondrial Morphology through the Association of Drp1 in Mammalian Cells.
    findings: []
  - id: PMID:31387448
    title: 'Mitochondria-hubs for regulating cellular biochemistry: emerging concepts and networks.'
    findings: []
  - id: PMID:31644573
    title: Armadillo repeat-containing protein 1 is a dual localization protein associated with mitochondrial
      intermembrane space bridging complex.
    findings: []
  - id: PMID:32296183
    title: A reference map of the human binary protein interactome.
    findings: []
  - id: PMID:33961781
    title: Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.
    findings: []
  - id: PMID:34800366
    title: Quantitative high-confidence human mitochondrial proteome and its dynamics in cellular context.
    findings: []
  - id: file:human/SAMM50/SAMM50-deep-research-falcon.md
    title: Falcon deep research on SAMM50 function
    findings:
      - statement: SAMM50 is the core Omp85-family beta-barrel subunit of the mitochondrial SAM complex.
      - statement: SAMM50/SAM mediates insertion and assembly of mitochondrial outer-membrane beta-barrel proteins.
      - statement: SAMM50 participates in SAM-MICOS/MIB contacts that affect cristae organization, but this is secondary
          to its core insertase role.
core_functions:
  - molecular_function:
      id: GO:0032977
      label: membrane insertase activity
    description: >-
      SAMM50 is the core Omp85-family membrane insertase of the mitochondrial SAM complex. It recognizes and assembles beta-barrel
      precursor proteins delivered by the TOM/IMS chaperone pathway and releases mature beta-barrels such as TOM40 and VDAC
      into the outer mitochondrial membrane.
    directly_involved_in:
      - id: GO:0045040
        label: protein insertion into mitochondrial outer membrane
    locations:
      - id: GO:0005741
        label: mitochondrial outer membrane
    in_complex:
      id: GO:0001401
      label: SAM complex
    supported_by:
      - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
        supporting_text: >-
          The **Sorting and Assembly Machinery (SAM)** is the **mitochondrial outer-membrane insertase** required for insertion/assembly
          of **β-barrel proteins** into the OMM. Its core subunit **Sam50 (SAMM50 in humans)** is itself an Omp85-family β-barrel
          protein; yeast SAM includes additional subunits (e.g., Sam35/Sam37/Mdm10/Mco6), whereas in mammals the accessory
          subunits are functionally replaced by **metaxins**. (ganesan2024biogenesisofmitochondrial pages 1-2, ravi2025mitochondrialsortingand
          pages 1-3)
      - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
        supporting_text: >-
          **Primary function:** SAMM50 is the core insertase/chaperone of the SAM complex that assembles **mitochondrial outer
          membrane β-barrel proteins** (including **Tom40** and **VDACs**) in an **energy-independent** manner. (ravi2025mitochondrialsortingand
          pages 1-3, ganesan2024biogenesisofmitochondrial pages 1-2)
      - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
        supporting_text: >-
          SAMM50/Sam50 is an **outer mitochondrial membrane (OMM)** protein. It is described as a **16-stranded transmembrane
          β-barrel** with a single N-terminal **POTRA** domain. In mitochondria, the POTRA domain is positioned to participate
          in intermembrane-space (IMS) interactions and outer–inner membrane contacts (e.g., with MICOS). (ravi2025mitochondrialsortingand
          pages 20-24, ganesan2024biogenesisofmitochondrial pages 1-2)
      - reference_id: file:human/SAMM50/SAMM50-deep-research-falcon.md
        supporting_text: >-
          SAMM50 (UniProt Q9Y512; SAM50/TRG-3) is a **mitochondrial outer membrane Omp85-family β-barrel insertase** and the
          **core subunit of the SAM complex**. Its primary, experimentally grounded role is the **assembly/insertion of OMM
          β-barrel proteins** (e.g., Tom40 and VDAC) delivered through the TOM→IMS chaperone→SAM pathway and assembled via
          **β-signal recognition**, **lateral gating**, and **β-barrel switching**. SAMM50 also serves as an organizational
          hub by forming **TOM–SAM** supercomplexes and participating in **SAM–MICOS** contact sites that connect outer-membrane
          protein biogenesis to **cristae junction organization**. In human populations, common SAMM50 variants show reproducible
          associations with **NAFLD risk** in some cohorts, supporting a role for mitochondrial membrane architecture pathways
          in metabolic liver disease susceptibility. (ganesan2024biogenesisofmitochondrial pages 1-2, zhao2023samm50rs2073082rs738491and
          pages 1-2)
proposed_new_terms: []
suggested_questions:
  - question: >-
      Should human SAMM50 be annotated directly to membrane insertase activity in GOA, and should that annotation be made
      with a contributes_to qualifier for the SAM complex or as enabled by the Sam50 subunit itself?
suggested_experiments:
  - description: >-
      Reconstitute the human SAMM50-MTX SAM complex with purified human TOM40 or VDAC beta-barrel precursors and assay insertion
      intermediates, lateral-gate mutants, and beta-signal dependence.
    hypothesis: >-
      Human SAMM50 provides the core membrane insertase activity for outer-membrane beta-barrel substrate assembly.

SAMM50

Gene Description

Existing Annotations Review

Core Functions

SAMM50 is the core Omp85-family membrane insertase of the mitochondrial SAM complex. It recognizes and assembles beta-barrel precursor proteins delivered by the TOM/IMS chaperone pathway and releases mature beta-barrels such as TOM40 and VDAC into the outer mitochondrial membrane.

References

Suggested Questions for Experts

Suggested Experiments

Deep Research

Falcon

Comprehensive research report: Human SAMM50 / SAM50 (UniProt Q9Y512) — functional annotation

0) Mandatory identity verification (disambiguation)

1) Key concepts and definitions (current understanding)

1.1 What is the SAM complex?

1.2 What are mitochondrial β-barrel proteins and why are they important?

1.3 “β-signal”, lateral gate, and “β-barrel switching” (mechanistic vocabulary)

2) Molecular function and mechanism (experimental + inference)

2.1 Subcellular localization and topology

2.2 Core function: insertion/assembly of OMM β-barrel proteins

2.3 Key binding partners and multi-complex organization

3) Recent developments (prioritizing 2023–2024)

3.1 2024 review synthesis: β-barrel biogenesis and SAM as a multi-pathway hub

3.2 2024 human genetics: SAMM50 variants associated with NAFLD risk and fibrosis proxy

3.3 2023–2024 disease/phenotype landscape (knowledge graph summary)

4) Current applications and real-world implementations

4.1 Variant interpretation and genetic risk modeling in steatotic liver disease

4.2 Functional genomics and mitochondrial biology toolchains

4.3 Translational concepts: targeting mitochondrial organization rather than a catalytic activity

5) Expert opinion and analysis (authoritative synthesis)

5.1 SAM/Sam50 as more than a β-barrel insertase

5.2 Mechanistic caution: association vs causality in human disease

6) Relevant statistics and data highlights (recent studies)

7) Concise functional annotation (summary)

Evidence table (quick reference)

Key URLs (most used sources)

Citations

📄 View Raw YAML