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.
| 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) |
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Download this section (compressed HTML)Q: 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?
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.
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