Voltage-dependent anion channel protein 2 (VDAC2)

Voltage-dependent anion channel protein 2 (VDAC2) is a member of the mitochondrial outer membrane porin family that forms ion channels regulating the flux of ions and metabolites—including ATP, ADP, and calcium ions—between mitochondria and the cytosol. Beyond transport functions, VDAC2 is crucial in multiple biological processes such as apoptosis regulation, steroidogenesis, reactive oxygen species homeostasis, and gametogenesis. VDAC2 interacts specifically with Bcl-2 family pro-apoptotic proteins (notably Bak), modulating cell death pathways. It is particularly important in heart muscle for excitation-contraction coupling and in sperm maturation and motility. The channel’s unique structure, with an extended N-terminal sequence and abundant cysteines, differentiates it from other VDAC isoforms, conferring distinct regulatory and anti-apoptotic properties. VDAC2 dysfunction or altered expression is implicated in a range of diseases, including cardiovascular disease, cancer, neurodegeneration, and infertility[1][3][5][7].

Other names

Non-selective voltage-gated ion channel VDAC2VDAC-2hVDAC2Outer mitochondrial membrane protein porin 2POREpididymis secretory sperm binding proteinMitochondrial porin 2

Modulation of VDAC2 activity alters transport of ions/metabolites, affecting mitochondrial function, apoptosis, and energy metabolism Drugs/compounds that activate or inhibit VDAC2 can impact mitochondrial calcium flux, apoptotic signaling (e.g., via Bcl-2 family interactions), and cellular bioenergetics[7].