6AGI

Crystal Structure of EFHA2 in Ca-binding State


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Dimerization of MICU Proteins Controls Ca2+Influx through the Mitochondrial Ca2+Uniporter.

Xing, Y.Wang, M.Wang, J.Nie, Z.Wu, G.Yang, X.Shen, Y.

(2019) Cell Rep 26: 1203-1212.e4

  • DOI: https://doi.org/10.1016/j.celrep.2019.01.022
  • Primary Citation of Related Structures:  
    6AGH, 6AGI, 6AGJ

  • PubMed Abstract: 

    The mitochondrial Ca 2+ uniporter complex (MCUC) is responsible for Ca 2+ influx into the mitochondrial matrix, playing critical roles in various mitochondrial functions. Eukaryotic MCUC consists of multiple subunits, and its Ca 2+ influx activity is controlled by regulatory subunits, including mitochondrial Ca 2+ uptake 1 (MICU1) and its paralogs (MICU2 and MICU3). However, the underlying mechanism remains unclear. Here, we determined multiple crystal structures of MICU2 and MICU3 from Homo sapiens. Our data demonstrate that distinct MICU protein N-domains determine the specific type of MICU dimers that perform the opposing roles in mitochondrial Ca 2+ uptake at low cytosolic Ca 2+ levels. In contrast, at high cytosolic Ca 2+ levels, all MICU proteins undergo dimer rearrangement induced by Ca 2+ binding, which releases the suppression of the MCUC pore-forming subunit and promotes the influx of large amounts of Ca 2+ . Altogether, our results elucidate the delicate mechanism of mitochondrial Ca 2+ uptake regulation by MICU proteins.


  • Organizational Affiliation

    State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium uptake protein 3, mitochondrial
A, B
382Homo sapiensMutation(s): 0 
Gene Names: MICU3EFHA2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q86XE3 (Homo sapiens)
Explore Q86XE3 
Go to UniProtKB:  Q86XE3
PHAROS:  Q86XE3
GTEx:  ENSG00000155970 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ86XE3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.387α = 90
b = 77.177β = 90
c = 172.669γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-23
    Type: Initial release
  • Version 1.1: 2019-08-14
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description