Crystal structure of Human Cardiac Calsequestrin

Experimental Data Snapshot

  • Resolution: 3.80 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.274 
  • R-Value Observed: 0.274 

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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:  

  • 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.

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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • 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

Structure Validation

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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