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- Ahting 2009 Biochim Biophys Acta + (The Tim23 protein is the key component of … The Tim23 protein is the key component of the mitochondrial import machinery. It locates to the inner mitochondrial membrane and its own import is dependent on the DDP1/TIM13 complex. Mutations in human DDP1 cause the Mohr-Tranebjaerg syndrome (MTS/DFN-1; OMIM #304700), which is one of the two known human diseases of the mitochondrial protein import machinery. We created a ''Tim23'' knockout mouse from a gene trap embryonic stem cell clone. Homozygous Tim23 mice were not viable. Heterozygous F1 mutants showed a 50% reduction of Tim23 protein in Western blot, a ''neurological phenotype'' and a markedly reduced life span. Haploinsufficiency of the ''Tim23'' mutation underlines the critical role of the mitochondrial import machinery for maintaining mitochondrial function.ry for maintaining mitochondrial function.)
