2VAF

Crystal structure of Human Cardiac Calsequestrin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.80 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.274 
  • R-Value Observed: 0.274 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Characterization of Human Cardiac Calsequestrin and its Deleterious Mutants.

Kim, E.Youn, B.Kemper, L.Campbell, C.Milting, H.Varsanyi, M.Kang, C.

(2007) J Mol Biol 373: 1047

  • DOI: https://doi.org/10.1016/j.jmb.2007.08.055
  • Primary Citation of Related Structures:  
    2VAF

  • PubMed Abstract: 

    Mutations of conserved residues of human cardiac calsequestrin (hCSQ2), a high-capacity, low-affinity Ca2+-binding protein in the sarcoplasmic reticulum, have been associated with catecholamine-induced polymorphic ventricular tachycardia (CPVT). In order to understand the molecular mechanism and pathophysiological link between these CPVT-related missense mutations of hCSQ2 and the resulting arrhythmias, we generated three CPVT-causing mutants of hCSQ2 (R33Q, L167H, and D307H) and two non-pathological mutants (T66A and V76M) and investigated the effect of these mutations. In addition, we determined the crystal structure of the corresponding wild-type hCSQ2 to gain insight into the structural effects of those mutations. Our data show clearly that all three CPVT-related mutations lead to significant reduction in Ca2+-binding capacity in spite of the similarity of their secondary structures to that of the wild-type hCSQ2. Light-scattering experiments indicate that the Ca2+-dependent monomer-polymer transitions of the mutants are quite different, confirming that the linear polymerization behavior of CSQ is linked directly to its high-capacity Ca2+ binding. R33Q and D307H mutations result in a monomer that appears to be unable to form a properly oriented dimer. On the other hand, the L167H mutant has a disrupted hydrophobic core in domain II, resulting in high molecular aggregates, which cannot respond to Ca2+. Although one of the non-pathological mutants, T66A, shares characteristics with the wild-type, the other null mutant, V76M, shows significantly altered Ca2+-binding and polymerization behaviors, calling for careful reconsideration of its status.


  • Organizational Affiliation

    School of Molecular Biosciences, Washington State University Pullman, WA 99164-4660, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CALSEQUESTRIN-2378Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O14958 (Homo sapiens)
Explore O14958 
Go to UniProtKB:  O14958
GTEx:  ENSG00000118729 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14958
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.80 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.274 
  • R-Value Observed: 0.274 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 150.65α = 90
b = 150.65β = 90
c = 227.47γ = 90
Software Package:
Software NamePurpose
X-PLORrefinement
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-09-11
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-05-22
    Changes: Data collection, Other, Refinement description
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Refinement description