3TRP

Crystal structure of recombinant rabbit skeletal calsequestrin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8817 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

High-capacity Ca2+ Binding of Human Skeletal Calsequestrin.

Sanchez, E.J.Lewis, K.M.Danna, B.R.Kang, C.

(2012) J.Biol.Chem. 287: 11592-11601

  • DOI: 10.1074/jbc.M111.335075
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Calsequestrin, the major calcium storage protein in both cardiac and skeletal muscle, binds large amounts of Ca(2+) in the sarcoplasmic reticulum and releases them during muscle contraction. For the first time, the crystal structures of Ca(2+) comple ...

    Calsequestrin, the major calcium storage protein in both cardiac and skeletal muscle, binds large amounts of Ca(2+) in the sarcoplasmic reticulum and releases them during muscle contraction. For the first time, the crystal structures of Ca(2+) complexes for both human (hCASQ1) and rabbit (rCASQ1) skeletal calsequestrin were determined, clearly defining their Ca(2+) sequestration capabilities through resolution of high- and low-affinity Ca(2+)-binding sites. rCASQ1 crystallized in low CaCl(2) buffer reveals three high-affinity Ca(2+) sites with trigonal bipyramidal, octahedral, and pentagonal bipyramidal coordination geometries, along with three low-affinity Ca(2+) sites. hCASQ1 crystallized in high CaCl(2) shows 15 Ca(2+) ions, including the six Ca(2+) ions in rCASQ1. Most of the low-affinity sites, some of which are μ-carboxylate-bridged, are established by the rotation of dimer interfaces, indicating cooperative Ca(2+) binding that is consistent with our atomic absorption spectroscopic data. On the basis of these findings, we propose a mechanism for the observed in vitro and in vivo dynamic high-capacity and low-affinity Ca(2+)-binding activity of calsequestrin.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calsequestrin-1
A
353Oryctolagus cuniculusMutation(s): 0 
Gene Names: CASQ1
Find proteins for P07221 (Oryctolagus cuniculus)
Go to Gene View: CASQ1
Go to UniProtKB:  P07221
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MRD
Query on MRD

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Download CCD File 
A
(4R)-2-METHYLPENTANE-2,4-DIOL
C6 H14 O2
SVTBMSDMJJWYQN-RXMQYKEDSA-N
 Ligand Interaction
MPD
Query on MPD

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8817 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.178 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 59.122α = 90.00
b = 144.863β = 90.00
c = 110.376γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-22
    Type: Initial release
  • Version 1.1: 2012-02-29
    Type: Database references
  • Version 1.2: 2012-07-18
    Type: Database references