6WDO

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

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 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 core components: the pore-forming MCU protein, the gatekeepers MICU1 and MICU2, and an auxiliary subunit, EMRE, essential for Ca 2+ transport 3-8 ...

    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
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uniporter protein, mitochondrial273Homo sapiensMutation(s): 0 
Gene Names: MCU, C10orf42, CCDC109A
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NE86 (Homo sapiens)
Explore Q8NE86 
Go to UniProtKB:  Q8NE86
PHAROS:  Q8NE86
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NE86
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Essential MCU regulator, mitochondrial53Homo sapiensMutation(s): 0 
Gene Names: SMDT1, C22orf32, EMRE
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H4I9 (Homo sapiens)
Explore Q9H4I9 
Go to UniProtKB:  Q9H4I9
PHAROS:  Q9H4I9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H4I9
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uniporter protein, mitochondrialC, K268Homo sapiensMutation(s): 0 
Gene Names: MCU, C10orf42, CCDC109A
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NE86 (Homo sapiens)
Explore Q8NE86 
Go to UniProtKB:  Q8NE86
PHAROS:  Q8NE86
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NE86
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 1, mitochondrialQ, S339Homo sapiensMutation(s): 0 
Gene Names: MICU1, CALC, CBARA1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BPX6 (Homo sapiens)
Explore Q9BPX6 
Go to UniProtKB:  Q9BPX6
PHAROS:  Q9BPX6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BPX6
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 2, mitochondrialR, T310Homo sapiensMutation(s): 0 
Gene Names: MICU2, EFHA1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IYU8 (Homo sapiens)
Explore Q8IYU8 
Go to UniProtKB:  Q8IYU8
PHAROS:  Q8IYU8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IYU8
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA
Download Ideal Coordinates CCD File 
U [auth A],
V [auth I]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

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