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
  • Structures With Same Primary Citation

  • 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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calcium uniporter protein, mitochondrial
A, E, G, I, M, O
273Homo sapiensMutation(s): 0 
Gene Names: MCUC10orf42CCDC109A
Find proteins for Q8NE86 (Homo sapiens)
Go to UniProtKB:  Q8NE86
NIH Common Fund Data Resources
PHAROS  Q8NE86

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Essential MCU regulator, mitochondrial
B, D, F, H, J, L, N, P
53Homo sapiensMutation(s): 0 
Gene Names: SMDT1C22orf32EMRE
Find proteins for Q9H4I9 (Homo sapiens)
Go to UniProtKB:  Q9H4I9
NIH Common Fund Data Resources
PHAROS  Q9H4I9

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Calcium uniporter protein, mitochondrial
C, K
268Homo sapiensMutation(s): 0 
Gene Names: MCUC10orf42CCDC109A
Find proteins for Q8NE86 (Homo sapiens)
Go to UniProtKB:  Q8NE86
NIH Common Fund Data Resources
PHAROS  Q8NE86

Find similar proteins by: Sequence  |  Structure

Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Calcium uptake protein 1, mitochondrial
Q, S
339Homo sapiensMutation(s): 0 
Gene Names: MICU1CALCCBARA1
Find proteins for Q9BPX6 (Homo sapiens)
Go to UniProtKB:  Q9BPX6
NIH Common Fund Data Resources
PHAROS  Q9BPX6

Find similar proteins by: Sequence  |  Structure

Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Calcium uptake protein 2, mitochondrial
R, T
310Homo sapiensMutation(s): 0 
Gene Names: MICU2EFHA1
Find proteins for Q8IYU8 (Homo sapiens)
Go to UniProtKB:  Q8IYU8
NIH Common Fund Data Resources
PHAROS  Q8IYU8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download CCD File 
A, 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



Entry History 

Deposition Data

Revision History 

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