TIMM9
Domain
The twin CX3C motif contains 4 conserved Cys residues that form 2 disulfide bonds in the mitochondrial intermembrane space. However, during the transit of TIMM9 from cytoplasm into mitochondrion, the Cys residues probably coordinate zinc, thereby preventing folding and allowing its transfer across mitochondrial outer membrane (Probable).
Function
Mitochondrial intermembrane chaperone that participates in the import and insertion of multi-pass transmembrane proteins into the mitochondrial inner membrane. May also be required for the transfer of beta-barrel precursors from the TOM complex to the sorting and assembly machinery (SAM complex) of the outer membrane. Acts as a chaperone-like protein that protects the hydrophobic precursors from aggregation and guide them through the mitochondrial intermembrane space.
Sequence Similarities
Belongs to the small Tim family.
Tissue Specificity
Ubiquitous, with highest expression in heart, kidney, liver and skeletal muscle.
Cellular localization
- Mitochondrion inner membrane
- Peripheral membrane protein
- Intermembrane side
Alternative names
TIM9, TIM9A, TIMM9A, TIMM9, Mitochondrial import inner membrane translocase subunit Tim9