6X4S

MCU-EMRE complex of a metazoan mitochondrial calcium uniporter

  • Classification: MEMBRANE PROTEIN
  • Organism(s): Tribolium castaneum
  • Expression System: Homo sapiens
  • Mutation(s): No 

  • Deposited: 2020-05-22 Released: 2020-09-02 
  • Deposition Author(s): Long, S.B., Wang, C., Baradaran, R.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Cancer Institute (NIH/NCI)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and Reconstitution of an MCU-EMRE Mitochondrial Ca 2+ Uniporter Complex.

Wang, C.Baradaran, R.Long, S.B.

(2020) J Mol Biol 432: 5632-5648

  • DOI: 10.1016/j.jmb.2020.08.013
  • Primary Citation of Related Structures:  
    6X4S

  • PubMed Abstract: 
  • The proteins MCU and EMRE form the minimal functional unit of the mitochondrial calcium uniporter complex in metazoans, a highly selective and tightly controlled Ca 2+ channel of the inner mitochondrial membrane that regulates cellular metabolism ...

    The proteins MCU and EMRE form the minimal functional unit of the mitochondrial calcium uniporter complex in metazoans, a highly selective and tightly controlled Ca 2+ channel of the inner mitochondrial membrane that regulates cellular metabolism. Here we present functional reconstitution of an MCU-EMRE complex from the red flour beetle, Tribolium castaneum, and a cryo-EM structure of the complex at 3.5 Å resolution. Using a novel assay, we demonstrate robust Ca 2+ uptake into proteoliposomes containing the purified complex. Uptake is dependent on EMRE and also on the mitochondrial lipid cardiolipin. The structure reveals a tetrameric channel with a single ion pore. EMRE is located at the periphery of the transmembrane domain and associates primarily with the first transmembrane helix of MCU. Coiled-coil and juxtamembrane domains within the matrix portion of the complex adopt markedly different conformations than in a structure of a human MCU-EMRE complex, suggesting that the structures represent different conformations of these functionally similar metazoan channels.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA. Electronic address: Longs@mskcc.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uniporter protein,Protein EMRE homolog, mitochondrial-like Protein fusion ABCDEFGH243Tribolium castaneumMutation(s): 0 
Gene Names: TcasGA2_TC013837TcasGA2_TC012057
Find proteins for D6X268 (Tribolium castaneum)
Explore D6X268 
Go to UniProtKB:  D6X268
Find proteins for D6WIX5 (Tribolium castaneum)
Explore D6WIX5 
Go to UniProtKB:  D6WIX5
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 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 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 StatesR35GM131921
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP30CA008748

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-02
    Type: Initial release
  • Version 1.1: 2020-09-30
    Changes: Database references
  • Version 1.2: 2020-10-14
    Changes: Database references