Calcium uniporter protein, mitochondrial - Q8NE86 (MCU_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q8NE86: 7
 
Function
Mitochondrial inner membrane calcium uniporter that mediates calcium uptake into mitochondria. Mitochondrial calcium homeostasis plays key roles in cellular physiology and regulates cell bioenergetics, cytoplasmic calcium signals and activation of cell death pathways (PubMed:21685888, PubMed:21685886, PubMed:23101630, PubMed:22904319, PubMed:23178883, PubMed:22829870, PubMed:22822213, PubMed:24332854, PubMed:26341627). Activity is regulated by MICU1 and MICU2. At low Ca(2+) levels MCU activity is down-regulated by MICU2; at higher Ca(2+) levels MICU1 increases MCU activity (PubMed:24560927). Regulates glucose-dependent insulin secretion in pancreatic beta-cells by regulating mitochondrial calcium uptake (PubMed:22904319, PubMed:22829870). Involved in buffering the amplitude of systolic calcium rises in cardiomyocytes (PubMed:22822213). UniProt
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Subunit Structure
Component of the uniplex complex, composed of MCU, MCUB, MICU1, MICU2 and EMRE/SMDT1 (PubMed:24231807). Heterotetramer with CCDC109B/MCUB; this inhibits channel activity (By similarity). Homooligomer (PubMed:21685886, PubMed:26341627). Homotetramer. Interacts with MICU1; MICU1 acts as an essential regulator for MCU (PubMed:21685886, PubMed:23101630, PubMed:23178883, PubMed:24332854, PubMed:26341627). Interacts with MCUR1 (PubMed:23178883, PubMed:26341627). Interactions with MICU1 and MCUR1 are mutually exclusive (PubMed:23178883). Interacts with MICU2 (PubMed:26341627). UniProt
Domain
The N-terminal domain is required for efficient Ca(2+) uptake and for interaction with MCUR1. It is not required for targeting to the mitochondria, oligomerization, interaction with MICU1 and MICU2, or assembly of the uniplex complex. UniProt
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  • 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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