TIMM50

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TIMM50 is a human gene that makes the Tim50 protein, a component of the TIM23 complex in the inner mitochondrial membrane. Tim50 acts as a receptor that recognizes the mitochondrial targeting signal on proteins and helps move them into the inner membrane and matrix.

Within the TIM23 machinery, Tim50 works alongside TIM23 and other pieces such as TIMM44 and DNAJC15. Its intermembrane-space domain helps regulate the TIM23 pore, contributing to the membrane’s permeability control. Tim50 is essential for proper import of proteins that carry signals to the mitochondria.

Genetic and clinical notes: TIMM50 is located on chromosome 19q13.2. The gene spans about 13,373 base pairs and encodes a protein of roughly 39.6 kDa in size, consisting of 353 amino acids. Inheritance is autosomal recessive. Mutations in TIMM50 can cause epilepsy, severe intellectual disability, and 3-methylglutaconic aciduria, a marker of mitochondrial dysfunction. Missense mutations are often linked to epileptic encephalopathy and variable mitochondrial complex V deficiency.

Expression and disease relevance: TIMM50 is widely expressed, with notable levels in several tissues, including parts of the heart, kidney, thyroid, brain, and colon. In breast cancer cells, TIMM50 expression is increased and is associated with reduced apoptosis and higher cell proliferation. Conversely, lower TIMM50 levels in heart tissue have been linked to cardiac hypertrophy.

Additional notes: TIMM50 directly interacts with Tim23 within the TIM23 complex; the TIM23 complex also connects to TIMM44 and DNAJC15. Some Tim50 isoforms may interact with other proteins such as COIL and snRNPs.