4NSD

Crystal Structure of CBARA1 in the Ca2+ Binding Form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.212 

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:  

  • 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 (MI ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calcium uptake protein 1, mitochondrial
A, B
351Homo sapiensMutation(s): 0 
Gene Names: MICU1 (CALC, CBARA1)
Find proteins for Q9BPX6 (Homo sapiens)
Go to Gene View: MICU1
Go to UniProtKB:  Q9BPX6
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MPD
Query on MPD

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Download CCD File 
B
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.212 
  • Space Group: I 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 99.283α = 90.00
b = 105.804β = 90.00
c = 156.851γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PHASERphasing
HKL-2000data reduction
MAR345dtbdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-02-26
    Type: Initial release
  • Version 1.1: 2014-04-23
    Type: Database references