4NSC

Crystal Structure of CBARA1 in the Apo-form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.254 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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: 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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 1, mitochondrial
A, B, C, D, E, F
A, B, C, D, E, F
401Homo sapiensMutation(s): 0 
Gene Names: MICU1CALCCBARA1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BPX6 (Homo sapiens)
Explore Q9BPX6 
Go to UniProtKB:  Q9BPX6
PHAROS:  Q9BPX6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BPX6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

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