6WDN

Cryo-EM structure of mitochondrial calcium uniporter holocomplex in low Ca2+


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure and mechanism of the mitochondrial Ca2+uniporter holocomplex.

Fan, M.Zhang, J.Tsai, C.W.Orlando, B.J.Rodriguez, M.Xu, Y.Liao, M.Tsai, M.F.Feng, L.

(2020) Nature 582: 129-133

  • DOI: 10.1038/s41586-020-2309-6
  • Primary Citation of Related Structures:  
    6WDN, 6WDO

  • PubMed Abstract: 
  • Mitochondria take up Ca 2+ through the mitochondrial calcium uniporter complex to regulate energy production, cytosolic Ca 2+ signalling and cell death 1,2 . In mammals, the uniporter complex (uniplex) contains four ...

    Mitochondria take up Ca 2+ through the mitochondrial calcium uniporter complex to regulate energy production, cytosolic Ca 2+ signalling and cell death 1,2 . In mammals, the uniporter complex (uniplex) contains four core components: the pore-forming MCU protein, the gatekeepers MICU1 and MICU2, and an auxiliary subunit, EMRE, essential for Ca 2+ transport 3-8 . To prevent detrimental Ca 2+ overload, the activity of MCU must be tightly regulated by MICUs, which sense changes in cytosolic Ca 2+ concentrations to switch MCU on and off 9,10 . Here we report cryo-electron microscopic structures of the human mitochondrial calcium uniporter holocomplex in inhibited and Ca 2+ -activated states. These structures define the architecture of this multicomponent Ca 2+ -uptake machinery and reveal the gating mechanism by which MICUs control uniporter activity. Our work provides a framework for understanding regulated Ca 2+ uptake in mitochondria, and could suggest ways of modulating uniporter activity to treat diseases related to mitochondrial Ca 2+ overload.


    Organizational Affiliation

    Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA. liangf@stanford.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 2, mitochondrialA335Homo sapiensMutation(s): 0 
Gene Names: MICU2EFHA1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Calcium Ion-Selective
Protein: 
mitochondrial calcium uniporter holocomplex, low Ca2+
Find proteins for Q8IYU8 (Homo sapiens)
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Go to UniProtKB:  Q8IYU8
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PHAROS  Q8IYU8
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 1, mitochondrialB363Homo sapiensMutation(s): 0 
Gene Names: MICU1CALCCBARA1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Calcium Ion-Selective
Protein: 
mitochondrial calcium uniporter holocomplex, low Ca2+
Find proteins for Q9BPX6 (Homo sapiens)
Explore Q9BPX6 
Go to UniProtKB:  Q9BPX6
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PHAROS  Q9BPX6
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Essential MCU regulator, mitochondrialDFHJ51Homo sapiensMutation(s): 0 
Gene Names: SMDT1C22orf32EMRE
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Calcium Ion-Selective
Protein: 
mitochondrial calcium uniporter holocomplex, low Ca2+
Find proteins for Q9H4I9 (Homo sapiens)
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Go to UniProtKB:  Q9H4I9
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PHAROS  Q9H4I9
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uniporter protein, mitochondrialCEGI178Homo sapiensMutation(s): 0 
Gene Names: MCUC10orf42CCDC109A
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Calcium Ion-Selective
Protein: 
mitochondrial calcium uniporter holocomplex, low Ca2+
Find proteins for Q8NE86 (Homo sapiens)
Explore Q8NE86 
Go to UniProtKB:  Q8NE86
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PHAROS  Q8NE86
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2020-05-27
    Type: Initial release
  • Version 1.1: 2020-06-17
    Changes: Database references