Mitochondrial calcium uniporter protein (MCU) (MCU)

The Mitochondrial calcium uniporter (MCU) is a highly selective ion channel located in the inner mitochondrial membrane that serves as the primary pathway for calcium entry into the mitochondrial matrix (UniProt Q9BPX6). It functions as part of a larger protein complex that includes regulatory subunits like MICU1 and MICU2, which sense cytosolic calcium levels to gate the channel (PubMed: 23791178). Biologically, MCU-mediated calcium uptake is essential for stimulating the citric acid cycle and matching ATP production with cellular energy demands (PubMed: 21685886). However, pathological over-activation of MCU leads to mitochondrial calcium overload, which triggers the opening of the mitochondrial permeability transition pore (mPTP) and initiates cell death pathways (PubMed: 26341540). Consequently, MCU is a major therapeutic target for treating ischemia-reperfusion injury in the heart and brain, as well as neurodegenerative diseases like Parkinson's and Alzheimer's (PubMed: 30143504). Experimental inhibitors like Ru360 and DS16570511 have shown promise in protecting tissues from calcium-mediated damage, though clinical translation remains challenging due to the channel's fundamental role in metabolism (PubMed: 31582550). Pharmacological modulation of this target requires a delicate balance to avoid disrupting essential bioenergetic processes while preventing toxic calcium accumulation.

Other names

CCDC109AMitochondrial calcium uniporter proteinMCU proteinCoiled-coil domain-containing protein 109A

Inhibition of mitochondrial calcium uptake to prevent mitochondrial permeability transition pore opening and cell death; or activation to enhance mitochondrial metabolism and ATP production.