TIMM44 encodes a matrix-facing, peripheral inner mitochondrial membrane coupling/scaffold component of the PAM import motor. It bridges the TIM23 channel to mitochondrial HSP70 and PAM co-chaperones, enabling ATP-dependent translocation of presequence-containing proteins into the mitochondrial matrix.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0001405 PAM complex, Tim23 associated import motor | IBA GO_REF:0000033 | ACCEPT | Summary: Correct and core. TIMM44 is a matrix-facing component of the PAM import motor coupled to TIM23. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** encodes *mitochondrial import inner membrane translocase subunit TIM44 (Tim44)*, a matrix-exposed component of the mitochondrial presequence import pathway that functionally couples the **TIM23** inner-membrane translocation channel to the **PAM** (presequence translocase–associated motor) mtHsp70-based import motor. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0030674 protein-macromolecule adaptor activity | IBA GO_REF:0000033 | ACCEPT | Summary: Correct and core. TIMM44 functions as a coupling/scaffold adaptor between TIM23 channel components and the PAM mtHsp70 motor. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0030150 protein import into mitochondrial matrix | IBA GO_REF:0000033 | ACCEPT | Summary: Correct and core. TIMM44 enables ATP-dependent TIM23/PAM-mediated import of presequence-containing proteins into the mitochondrial matrix. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md A large fraction of nuclear-encoded mitochondrial proteins are synthesized in the cytosol as precursors with N-terminal targeting presequences and are imported across the inner membrane through the **TIM23** translocase. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0051087 protein-folding chaperone binding | IBA GO_REF:0000033 | ACCEPT | Summary: Correct. TIMM44 recruits and positions mtHsp70 and PAM co-chaperones at the matrix side of TIM23, making chaperone binding central to its import-motor role. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. |
| GO:0005743 mitochondrial inner membrane | IEA GO_REF:0000120 | ACCEPT | Summary: Correct. TIMM44 is matrix-exposed and peripherally associated with the mitochondrial inner membrane. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005759 mitochondrial matrix | IEA GO_REF:0000044 | ACCEPT | Summary: Correct. TIMM44 is matrix-exposed and peripherally associated with the mitochondrial inner membrane. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0030150 protein import into mitochondrial matrix | IEA GO_REF:0000002 | ACCEPT | Summary: Correct and core. TIMM44 enables ATP-dependent TIM23/PAM-mediated import of presequence-containing proteins into the mitochondrial matrix. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md A large fraction of nuclear-encoded mitochondrial proteins are synthesized in the cytosol as precursors with N-terminal targeting presequences and are imported across the inner membrane through the **TIM23** translocase. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0045184 establishment of protein localization | IEA GO_REF:0000117 | MARK AS OVER ANNOTATED | Summary: Correct pathway family but too broad. TIMM44 specifically supports mitochondrial presequence protein import via TIM23/PAM. Reason: Use mitochondrial matrix import and PAM adaptor/chaperone-binding terms instead of generic establishment of protein localization. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md A large fraction of nuclear-encoded mitochondrial proteins are synthesized in the cytosol as precursors with N-terminal targeting presequences and are imported across the inner membrane through the **TIM23** translocase. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0051087 protein-folding chaperone binding | IEA GO_REF:0000002 | ACCEPT | Summary: Correct. TIMM44 recruits and positions mtHsp70 and PAM co-chaperones at the matrix side of TIM23, making chaperone binding central to its import-motor role. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. |
| GO:0005515 protein binding | IPI PMID:12620389 Novel raf kinase protein-protein interactions found by an ex... | MARK AS OVER ANNOTATED | Summary: Protein binding is too generic for TIMM44. The informative molecular role is adaptor/scaffold coupling of TIM23 channel components with mtHsp70/PAM motor components. Reason: Replace generic protein-binding capture with protein-macromolecule adaptor activity and protein-folding chaperone binding where supported. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. |
| GO:0005515 protein binding | IPI PMID:25416956 A proteome-scale map of the human interactome network. | MARK AS OVER ANNOTATED | Summary: Protein binding is too generic for TIMM44. The informative molecular role is adaptor/scaffold coupling of TIM23 channel components with mtHsp70/PAM motor components. Reason: Replace generic protein-binding capture with protein-macromolecule adaptor activity and protein-folding chaperone binding where supported. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. |
| GO:0005515 protein binding | IPI PMID:25910212 Widespread macromolecular interaction perturbations in human... | MARK AS OVER ANNOTATED | Summary: Protein binding is too generic for TIMM44. The informative molecular role is adaptor/scaffold coupling of TIM23 channel components with mtHsp70/PAM motor components. Reason: Replace generic protein-binding capture with protein-macromolecule adaptor activity and protein-folding chaperone binding where supported. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. |
| GO:0005515 protein binding | IPI PMID:32296183 A reference map of the human binary protein interactome. | MARK AS OVER ANNOTATED | Summary: Protein binding is too generic for TIMM44. The informative molecular role is adaptor/scaffold coupling of TIM23 channel components with mtHsp70/PAM motor components. Reason: Replace generic protein-binding capture with protein-macromolecule adaptor activity and protein-folding chaperone binding where supported. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. |
| GO:0005515 protein binding | IPI PMID:32814053 Interactome Mapping Provides a Network of Neurodegenerative ... | MARK AS OVER ANNOTATED | Summary: Protein binding is too generic for TIMM44. The informative molecular role is adaptor/scaffold coupling of TIM23 channel components with mtHsp70/PAM motor components. Reason: Replace generic protein-binding capture with protein-macromolecule adaptor activity and protein-folding chaperone binding where supported. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md **Primary function (conceptual definition):** TIMM44 is best understood as a **two-domain coupling protein/scaffold** positioned at the matrix face of the inner membrane that (i) binds components of the TIM23 channel and (ii) recruits/positions mtHsp70 and its co-chaperones so that cycles of ATP-dependent substrate binding and release can drive vectorial translocation. file:human/TIMM44/TIMM44-deep-research-falcon.md In a mechanistic dissection of Tim44 (yeast Tim44; with explicit relevance to human TIMM44 via conserved architecture and discussion of a human variant), the **N-terminal domain** binds import-motor components including **mtHsp70** and the **Tim14–Tim16 (Pam18–Pam16)** subcomplex, whereas the **C-terminal domain** binds the channel, with a particularly strong interaction with **Tim17**, and lies near translocating precursor polypeptides. |
| GO:0005743 mitochondrial inner membrane | NAS PMID:10339406 Genetic and structural characterization of the human mitocho... | ACCEPT | Summary: Correct. TIMM44 is matrix-exposed and peripherally associated with the mitochondrial inner membrane. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005744 TIM23 mitochondrial import inner membrane translocase complex | NAS PMID:10339406 Genetic and structural characterization of the human mitocho... | MODIFY | Summary: TIMM44 is functionally coupled to TIM23, but the more precise complex term is PAM complex rather than the TIM23 translocase core complex. Reason: Use the PAM complex term for TIMM44 complex membership; TIMM44 bridges to TIM23 but is best curated as a PAM import-motor component. Proposed replacements: PAM complex, Tim23 associated import motor Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** encodes *mitochondrial import inner membrane translocase subunit TIM44 (Tim44)*, a matrix-exposed component of the mitochondrial presequence import pathway that functionally couples the **TIM23** inner-membrane translocation channel to the **PAM** (presequence translocase–associated motor) mtHsp70-based import motor. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0006886 intracellular protein transport | NAS PMID:10339406 Genetic and structural characterization of the human mitocho... | MARK AS OVER ANNOTATED | Summary: Correct pathway family but too broad. TIMM44 functions in TIM23/PAM-mediated mitochondrial presequence import, not general intracellular protein transport. Reason: Prefer protein import into mitochondrial matrix and PAM complex terms. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md A large fraction of nuclear-encoded mitochondrial proteins are synthesized in the cytosol as precursors with N-terminal targeting presequences and are imported across the inner membrane through the **TIM23** translocase. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0030150 protein import into mitochondrial matrix | TAS PMID:10339406 Genetic and structural characterization of the human mitocho... | ACCEPT | Summary: Correct and core. TIMM44 enables ATP-dependent TIM23/PAM-mediated import of presequence-containing proteins into the mitochondrial matrix. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md A large fraction of nuclear-encoded mitochondrial proteins are synthesized in the cytosol as precursors with N-terminal targeting presequences and are imported across the inner membrane through the **TIM23** translocase. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005739 mitochondrion | IDA GO_REF:0000052 | MARK AS OVER ANNOTATED | Summary: Correct but broad. TIMM44 is specifically matrix-facing and associated with the mitochondrial inner membrane/PAM import motor. Reason: Prefer mitochondrial inner membrane, mitochondrial matrix, and PAM complex annotations over generic mitochondrion. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005739 mitochondrion | HTP PMID:34800366 Quantitative high-confidence human mitochondrial proteome an... | MARK AS OVER ANNOTATED | Summary: Correct but broad. TIMM44 is specifically matrix-facing and associated with the mitochondrial inner membrane/PAM import motor. Reason: Prefer mitochondrial inner membrane, mitochondrial matrix, and PAM complex annotations over generic mitochondrion. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005744 TIM23 mitochondrial import inner membrane translocase complex | IDA PMID:30598479 ROMO1 is a constituent of the human presequence translocase ... | MODIFY | Summary: TIMM44 is functionally coupled to TIM23, but the more precise complex term is PAM complex rather than the TIM23 translocase core complex. Reason: Use the PAM complex term for TIMM44 complex membership; TIMM44 bridges to TIM23 but is best curated as a PAM import-motor component. Proposed replacements: PAM complex, Tim23 associated import motor Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** encodes *mitochondrial import inner membrane translocase subunit TIM44 (Tim44)*, a matrix-exposed component of the mitochondrial presequence import pathway that functionally couples the **TIM23** inner-membrane translocation channel to the **PAM** (presequence translocase–associated motor) mtHsp70-based import motor. file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005743 mitochondrial inner membrane | IDA PMID:20053669 Role of Magmas in protein transport and human mitochondria b... | ACCEPT | Summary: Correct. TIMM44 is matrix-exposed and peripherally associated with the mitochondrial inner membrane. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005743 mitochondrial inner membrane | IDA PMID:10339406 Genetic and structural characterization of the human mitocho... | ACCEPT | Summary: Correct. TIMM44 is matrix-exposed and peripherally associated with the mitochondrial inner membrane. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
| GO:0005759 mitochondrial matrix | IDA PMID:10339406 Genetic and structural characterization of the human mitocho... | ACCEPT | Summary: Correct. TIMM44 is matrix-exposed and peripherally associated with the mitochondrial inner membrane. Supporting Evidence: file:human/TIMM44/TIMM44-deep-research-falcon.md TIMM44 is **matrix-exposed** and **peripherally associated with the inner mitochondrial membrane** (i.e., it is not itself the transmembrane pore). file:human/TIMM44/TIMM44-deep-research-falcon.md Human **TIMM44** is a matrix-facing, inner-membrane–associated coupling/scaffold protein that is essential for **TIM23-mediated presequence protein import** by physically and functionally bridging the TIM23 channel (notably via Tim17 binding) to the **PAM mtHsp70 motor** (via N-terminal interactions with mtHsp70 and Pam16/Pam18), enabling ATP-driven translocation into the mitochondrial matrix. |
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Download this section (compressed HTML)Q: Which TIMM44 surfaces most strongly determine TIM23 channel binding versus mtHsp70/PAM motor recruitment in human cells?
Q: Do cancer and angiogenesis phenotypes from TIMM44 inhibition reflect direct import failure, secondary ATP/ROS stress, or both?
Experiment: Perform rescue of TIMM44-depleted human cells with N-domain and C-domain interface mutants, then quantify TIM23 complex association, mtHsp70 recruitment, and matrix-import reporter flux.
Hypothesis: TIMM44 channel-binding and motor-recruitment functions can be separated by domain-specific mutants.
Experiment: Compare MB-10 treatment with TIMM44 knockout and resistant TIMM44 rescue for acute precursor import, PAM/TIM23 assembly, ATP/ROS changes, and Akt-mTOR signaling readouts.
Hypothesis: MB-10 phenotypes primarily reflect inhibition of TIMM44-dependent protein import.
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