5BZ6

Crystal structure of the N-terminal domain single mutant (S92A) of the human mitochondrial calcium uniporter fused with T4 lysozyme


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.167 

Starting Models: experimental
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This is version 1.4 of the entry. See complete history


Literature

Structure and function of the N-terminal domain of the human mitochondrial calcium uniporter.

Lee, Y.Min, C.K.Kim, T.G.Song, H.K.Lim, Y.Kim, D.Shin, K.Kang, M.Kang, J.Y.Youn, H.S.Lee, J.G.An, J.Y.Park, K.R.Lim, J.J.Kim, J.H.Kim, J.H.Park, Z.Y.Kim, Y.S.Wang, J.Kim, D.H.Eom, S.H.

(2015) EMBO Rep 16: 1318-1333

  • DOI: https://doi.org/10.15252/embr.201540436
  • Primary Citation of Related Structures:  
    4XSJ, 4XTB, 5BZ6

  • PubMed Abstract: 

    The mitochondrial calcium uniporter (MCU) is responsible for mitochondrial calcium uptake and homeostasis. It is also a target for the regulation of cellular anti-/pro-apoptosis and necrosis by several oncogenes and tumour suppressors. Herein, we report the crystal structure of the MCU N-terminal domain (NTD) at a resolution of 1.50 Å in a novel fold and the S92A MCU mutant at 2.75 Å resolution; the residue S92 is a predicted CaMKII phosphorylation site. The assembly of the mitochondrial calcium uniporter complex (uniplex) and the interaction with the MCU regulators such as the mitochondrial calcium uptake-1 and mitochondrial calcium uptake-2 proteins (MICU1 and MICU2) are not affected by the deletion of MCU NTD. However, the expression of the S92A mutant or a NTD deletion mutant failed to restore mitochondrial Ca(2+) uptake in a stable MCU knockdown HeLa cell line and exerted dominant-negative effects in the wild-type MCU-expressing cell line. These results suggest that the NTD of MCU is essential for the modulation of MCU function, although it does not affect the uniplex formation.


  • Organizational Affiliation

    School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lysozyme,Calcium uniporter protein, mitochondrial262Tequatrovirus T4Homo sapiens
This entity is chimeric
Mutation(s): 4 
Gene Names: eT4Tp126MCUC10orf42CCDC109A
EC: 3.2.1.17
UniProt & NIH Common Fund Data Resources
Find proteins for D9IEF7 (Enterobacteria phage T4)
Explore D9IEF7 
Go to UniProtKB:  D9IEF7
Find proteins for Q8NE86 (Homo sapiens)
Explore Q8NE86 
Go to UniProtKB:  Q8NE86
PHAROS:  Q8NE86
GTEx:  ENSG00000156026 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsD9IEF7Q8NE86
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.167 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.803α = 90
b = 97.803β = 90
c = 61.537γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data processing
PHASERphasing

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-16
    Type: Initial release
  • Version 1.1: 2015-09-23
    Changes: Other
  • Version 1.2: 2015-10-14
    Changes: Database references
  • Version 1.3: 2019-12-25
    Changes: Derived calculations, Source and taxonomy, Structure summary
  • Version 1.4: 2023-11-08
    Changes: Data collection, Database references, Refinement description