6O5B

Monomer of a cation channel


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.6 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

Structural Mechanism of EMRE-Dependent Gating of the Human Mitochondrial Calcium Uniporter.

Wang, Y.Nguyen, N.X.She, J.Zeng, W.Yang, Y.Bai, X.C.Jiang, Y.

(2019) Cell 177: 1252

  • DOI: 10.1016/j.cell.2019.03.050
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mitochondrial calcium uptake is crucial to the regulation of eukaryotic Ca <sup>2+ </sup> homeostasis and is mediated by the mitochondrial calcium uniporter (MCU). While MCU alone can transport Ca <sup>2+ </sup> in primitive eukaryotes, metazoans req ...

    Mitochondrial calcium uptake is crucial to the regulation of eukaryotic Ca 2+ homeostasis and is mediated by the mitochondrial calcium uniporter (MCU). While MCU alone can transport Ca 2+ in primitive eukaryotes, metazoans require an essential single membrane-spanning auxiliary component called EMRE to form functional channels; however, the molecular mechanism of EMRE regulation remains elusive. Here, we present the cryo-EM structure of the human MCU-EMRE complex, which defines the interactions between MCU and EMRE as well as pinpoints the juxtamembrane loop of MCU and extended linker of EMRE as the crucial elements in the EMRE-dependent gating mechanism among metazoan MCUs. The structure also features the dimerization of two MCU-EMRE complexes along an interface at the N-terminal domain (NTD) of human MCU that is a hotspot for post-translational modifications. Thus, the human MCU-EMRE complex, which constitutes the minimal channel components among metazoans, provides a framework for future mechanistic studies on MCU.


    Organizational Affiliation

    Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA; Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA; Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA. Electronic address: youxing.jiang@utsouthwestern.edu.,Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA; Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA. Electronic address: xiaochen.bai@utsouthwestern.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calcium uniporter protein, mitochondrial
J, K, E, C, A, L, I, G
351Homo sapiensMutation(s): 0 
Gene Names: MCU (C10orf42, CCDC109A)
Find proteins for Q8NE86 (Homo sapiens)
Go to Gene View: MCU
Go to UniProtKB:  Q8NE86
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Essential MCU regulator, mitochondrial
F, D, B, H
107Homo sapiensMutation(s): 0 
Gene Names: SMDT1 (C22orf32, EMRE)
Find proteins for Q9H4I9 (Homo sapiens)
Go to Gene View: SMDT1
Go to UniProtKB:  Q9H4I9
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
G
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical InstituteUnited States--

Revision History 

  • Version 1.0: 2019-05-22
    Type: Initial release
  • Version 1.1: 2019-05-29
    Type: Data collection, Database references