Mitochondrial import inner membrane translocase subunit Tim13

TIMM13 (Mitochondrial import inner membrane translocase subunit Tim13) is a mitochondrial intermembrane chaperone that facilitates the import and insertion of multi-pass transmembrane proteins into the mitochondrial inner membrane (UniProt: Q9Y5L4). It forms the TIMM8–TIMM13 complex to mediate protein transfer through the intermembrane space and coordinates with the TOM and SAM machinery for beta-barrel precursor trafficking. The protein acts as a protective chaperone against hydrophobic precursor aggregation during mitochondrial import.

TIMM13 is involved in core mitochondrial protein homeostasis, a fundamental process for cellular energy metabolism and organellar function. No specific disease associations are documented in UniProt for this protein.

In Alzheimer's disease, TIMM13 is significantly down-regulated in post-mortem AD brain tissue compared to age-matched controls (mean log2 fold-change: −0.173; Chaparral AD proteomics). This finding derives from quantitative proteomics analysis of four subcellular fractions in human post-mortem tissue. The downregulation suggests impaired mitochondrial protein import capacity in AD pathology, potentially contributing to mitochondrial dysfunction observed in the disease.