Crystal Structure of CBARA1 in the Apo-form

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.254 

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Structural and mechanistic insights into MICU1 regulation of mitochondrial calcium uptake.

Wang, L.Yang, X.Li, S.Wang, Z.Liu, Y.Feng, J.Zhu, Y.Shen, Y.

(2014) EMBO J 33: 594-604

  • DOI: https://doi.org/10.1002/embj.201386523
  • Primary Citation of Related Structures:  
    4NSC, 4NSD

  • PubMed Abstract: 

    Mitochondrial calcium uptake is a critical event in various cellular activities. Two recently identified proteins, the mitochondrial Ca(2+) uniporter (MCU), which is the pore-forming subunit of a Ca(2+) channel, and mitochondrial calcium uptake 1 (MICU1), which is the regulator of MCU, are essential in this event. However, the molecular mechanism by which MICU1 regulates MCU remains elusive. In this study, we report the crystal structures of Ca(2+)-free and Ca(2+)-bound human MICU1. Our studies reveal that Ca(2+)-free MICU1 forms a hexamer that binds and inhibits MCU. Upon Ca(2+) binding, MICU1 undergoes large conformational changes, resulting in the formation of multiple oligomers to activate MCU. Furthermore, we demonstrate that the affinity of MICU1 for Ca(2+) is approximately 15-20 μM. Collectively, our results provide valuable details to decipher the molecular mechanism of MICU1 regulation of mitochondrial calcium uptake.

  • Organizational Affiliation

    State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium uptake protein 1, mitochondrial
A, B, C, D, E
A, B, C, D, E, F
401Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BPX6 (Homo sapiens)
Explore Q9BPX6 
Go to UniProtKB:  Q9BPX6
GTEx:  ENSG00000107745 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BPX6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.254 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.879α = 90
b = 146.819β = 111.08
c = 115.872γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-26
    Type: Initial release
  • Version 1.1: 2014-04-23
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references