Mitochondrial calcium uptake protein 2 (MICU2)

MICU2 (mitochondrial calcium uptake protein 2) is an EF-hand-containing regulatory subunit of the mitochondrial calcium uniporter (MCU) complex, found in the inner mitochondrial membrane[1][5]. It forms heterodimers with MICU1 to act as a gatekeeper for calcium entry, inhibiting uniporter activation at low cytosolic calcium levels and allowing activation only above a specific threshold[5]. This process is essential for maintaining metabolic homeostasis, supporting ATP production, enabling cellular signaling, and preventing mitochondrial calcium overload that could trigger apoptosis[2][5]. MICU2’s structure comprises two lobes with pairs of EF-hands; its C-terminal helix is crucial for function[1][5]. Dysfunction of MICU2 or its complex partners is implicated in diseases such as cardiac disorders, neurodegeneration, and cancer due to dysregulated mitochondrial calcium signaling[2][5]. Drugs may target the MCU complex globally, but MICU2-specific modulation remains a research focus. Therapeutic manipulation of the MCU complex, including MICU2, faces challenges due to potential systemic effects on cell survival and energy metabolism[2][5].

Other names

MICU2Mitochondrial calcium uptake 2EF-hand-containing protein MICU2

Inhibition of mitochondrial calcium uptake by blocking MCU complex (drugs block the pore, not MICU2 specifically). Modulation of MICU2 may alter the calcium uptake threshold, affecting cell energetics and apoptosis.