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- W3174237579 abstract "The mitochondrial Ca2 uniporter complex (MCUC) is responsible for Ca2 influx into the mitochondrial matrix, playing critical roles in various mitochondrial functions. Eukaryotic MCUC consists of multiple subunits and its Ca2 influx activity is controlled by regulatory subunits, including mitochondrial Ca2 uptake 1 (MICU1) and its paralogs (MICU2 and MICU3). However, the underlying mechanism remains unclear. Here, we determined multiple crystal structures of MICU2 and MICU3 from Homo sapiens. Our structural analysis together with cell biology data demonstrate that distinct MICU protein N-domains determine the specific type of MICU dimers that perform the opposing roles in mitochondrial Ca2 uptake at low cytosolic Ca2 levels. In contrast, at high cytosolic Ca2 levels, all MICU proteins undergo dimer rearrangement induced by Ca2 binding, which releases the suppression of the MCUC pore-forming subunit and promotes the influx of large amounts of Ca2 . Altogether, our results elucidate the delicate mechanism of mitochondrial Ca2 uptake regulation by MICU proteins." @default.
- W3174237579 created "2021-07-05" @default.
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- W3174237579 date "2018-01-01" @default.
- W3174237579 modified "2023-09-23" @default.
- W3174237579 title "Dimerization of MICU Proteins Controls Ca <sup>2 </sup> Influx Through the Mitochondrial Ca <sup>2 </sup> Uniporter" @default.
- W3174237579 doi "https://doi.org/10.2139/ssrn.3263633" @default.
- W3174237579 hasPublicationYear "2018" @default.
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