Calcium uptake protein 1, mitochondrial - Q9BPX6 (MICU1_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9BPX6: 2
 
Function
Key regulator of mitochondrial calcium uniporter (MCU) that senses calcium level via its EF-hand domains (PubMed:20693986, PubMed:23101630, PubMed:23747253, PubMed:24313810, PubMed:24332854, PubMed:24503055, PubMed:24560927, PubMed:26341627, PubMed:26903221, PubMed:27099988). MICU1 and MICU2 form a disulfide-linked heterodimer that stimulates and inhibits MCU activity, depending on the concentration of calcium. MICU1 acts both as an activator or inhibitor of mitochondrial calcium uptake (PubMed:26903221). Acts as a gatekeeper of MCU at low concentration of calcium, preventing channel opening (PubMed:26903221). Enhances MCU opening at high calcium concentration, allowing a rapid response of mitochondria to calcium signals generated in the cytoplasm (PubMed:24560927, PubMed:26903221). Regulates glucose-dependent insulin secretion in pancreatic beta-cells by regulating mitochondrial calcium uptake (PubMed:22904319). Induces T-helper 1-mediated autoreactivity, which is accompanied by the release of IFNG (PubMed:16002733). UniProt
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Subunit Structure
Homohexamer; in absence of calcium (PubMed:24514027). Forms a homohexamer in absence of calcium and rearranges into a heterodimer in presence of calcium (PubMed:26489515, PubMed:24514027). Heterodimer; disulfide-linked; heterodimerizes with MICU2 (PubMed:24560927). The heterodimer formed with MICU2 associates with MCU at low calcium concentration and dissociates from MCU at high calcium level (PubMed:26387864). Component of the uniplex complex, composed of MCU, MCUB, MICU1, MICU2 and EMRE/SMDT1 (PubMed:24231807). Interacts (via polybasic region) with EMRE/SMDT1; the interaction is direct (PubMed:27099988). Interacts (via polybasic region) with MCU (via coiled coil domains); the interaction is direct and precedes formation of the heterodimer with MICU2 (PubMed:21685886, PubMed:23101630, PubMed:23178883, PubMed:24332854, PubMed:26387864). Interacts with SLC25A23 (PubMed:24430870). Interacts with CHCHD4/MIA40; which introduces the interchain disulfide bond with MICU2 (PubMed:26387864). UniProt
Domain
The EF-hand domains have high affinity for calcium and act as sensors of calcium levels (PubMed:23101630, PubMed:24560927). UniProt
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Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
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Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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