6DNF

Cryo-EM structure of the mitochondrial calcium uniporter MCU from the fungus Cyphellophora europaea


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 1.3 of the entry. See complete history


Literature

Cryo-EM structures of fungal and metazoan mitochondrial calcium uniporters.

Baradaran, R.Wang, C.Siliciano, A.F.Long, S.B.

(2018) Nature 559: 580-584

  • DOI: 10.1038/s41586-018-0331-8
  • Primary Citation of Related Structures:  
    6DNF

  • PubMed Abstract: 
  • The mitochondrial calcium uniporter (MCU) is a highly selective calcium channel and a major route of calcium entry into mitochondria. How the channel catalyses ion permeation and achieves ion selectivity are not well understood, partly because MCU is tho ...

    The mitochondrial calcium uniporter (MCU) is a highly selective calcium channel and a major route of calcium entry into mitochondria. How the channel catalyses ion permeation and achieves ion selectivity are not well understood, partly because MCU is thought to have a distinct architecture in comparison to other cellular channels. Here we report cryo-electron microscopy reconstructions of MCU channels from zebrafish and Cyphellophora europaea at 8.5 Å and 3.2 Å resolutions, respectively. In contrast to a previous report of pentameric stoichiometry for MCU, both channels are tetramers. The atomic model of C. europaea MCU shows that a conserved WDXXEP signature sequence forms the selectivity filter, in which calcium ions are arranged in single file. Coiled-coil legs connect the pore to N-terminal domains in the mitochondrial matrix. In C. europaea MCU, the N-terminal domains assemble as a dimer of dimers; in zebrafish MCU, they form an asymmetric crescent. The structures define principles that underlie ion permeation and calcium selectivity in this unusual channel.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA. longs@mskcc.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mitochondrial calcium uniporter MCU ABCD352Cyphellophora europaea CBS 101466Mutation(s): 0 
Gene Names: HMPREF1541_00236
Find proteins for W2SDE2 (Cyphellophora europaea CBS 101466)
Explore W2SDE2 
Go to UniProtKB:  W2SDE2
Protein Feature View
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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

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM094273

Revision History 

  • Version 1.0: 2018-07-11
    Type: Initial release
  • Version 1.1: 2018-07-25
    Changes: Data collection, Database references
  • Version 1.2: 2018-08-08
    Changes: Data collection, Database references
  • Version 1.3: 2020-01-08
    Changes: Author supporting evidence