Mitochondrial import inner membrane translocase subunit Tim22 (TIMM22)

Mitochondrial import inner membrane translocase subunit Tim22 (TIMM22) is an essential core component of the mitochondrial inner membrane TIM22 complex, a multiprotein transporter responsible for importing and integrating multi-pass transmembrane proteins—particularly carrier proteins—into the mitochondrial inner membrane[1][2][3]. TIMM22 forms the central voltage-activated and signal-gated channel of the TIM22 complex, using the membrane potential to drive protein translocation across two voltage-dependent steps[2][3]. The human TIM22 complex comprises several subunits, including Tim22, Tim29, three small Tim proteins (Tim9, Tim10a, Tim10b), and acylglycerol kinase (AGK)[3]. TIMM22’s function is crucial for mitochondrial biogenesis, cellular metabolism, and homeostasis[1][3]. Mutations in TIMM22 are linked to severe mitochondrial disorders, such as early-onset mitochondrial myopathy and combined oxidative phosphorylation deficiency[2][3]. No approved drugs directly target TIMM22, and the therapeutic modulation of this complex presents significant safety concerns due to its central role in mitochondrial protein import[3].

Other names

Translocase of inner mitochondrial membrane 22TIM22Mitochondrial import inner membrane translocase subunit Tim22TEX4Testis-expressed protein 4COXPD43Translocase of inner mitochondrial membrane 22 homologTestis-expressed sequence 4

No drugs targeting TIMM22 are reported; therefore, mechanisms of drug action are not established for this target.