SERCA2a from pig heart

Experimental Data Snapshot

  • Resolution: 3.30 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 

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This is version 1.3 of the entry. See complete history


Structures of the heart specific SERCA2a Ca2+-ATPase.

Sitsel, A.De Raeymaecker, J.Drachmann, N.D.Derua, R.Smaardijk, S.Andersen, J.L.Vandecaetsbeek, I.Chen, J.De Maeyer, M.Waelkens, E.Olesen, C.Vangheluwe, P.Nissen, P.

(2019) EMBO J 38

  • DOI: https://doi.org/10.15252/embj.2018100020
  • Primary Citation of Related Structures:  
    5MPM, 6HXB

  • PubMed Abstract: 

    The sarcoplasmic/endoplasmic reticulum Ca 2+ -ATPase 2a (SERCA2a) performs active reuptake of cytoplasmic Ca 2+ and is a major regulator of cardiac muscle contractility. Dysfunction or dysregulation of SERCA2a is associated with heart failure, while restoring its function is considered as a therapeutic strategy to restore cardiac performance. However, its structure has not yet been determined. Based on native, active protein purified from pig ventricular muscle, we present the first crystal structures of SERCA2a, determined in the CPA-stabilized E2-AlF4- form (3.3 Å) and the Ca 2+ -occluded [Ca 2 ]E1-AMPPCP form (4.0 Å). The structures are similar to the skeletal muscle isoform SERCA1a pointing to a conserved mechanism. We seek to explain the kinetic differences between SERCA1a and SERCA2a. We find that several isoform-specific residues are acceptor sites for post-translational modifications. In addition, molecular dynamics simulations predict that isoform-specific residues support distinct intramolecular interactions in SERCA2a and SERCA1a. Our experimental observations further indicate that isoform-specific intramolecular interactions are functionally relevant, and may explain the kinetic differences between SERCA2a and SERCA1a.

  • Organizational Affiliation

    Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sarcoplasmic/endoplasmic reticulum calcium ATPase 2997Sus scrofaMutation(s): 0 
Membrane Entity: Yes 
Find proteins for P11607 (Sus scrofa)
Explore P11607 
Go to UniProtKB:  P11607
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11607
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.30 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.349α = 90
b = 253.287β = 100.86
c = 64.981γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
The Danish National Research Foundation - Center for Membrane Pumps in Cells and Disease (PUMPkin)Denmark--
European Research Council Advanced Research grant BIOMEMOS--
Karen Elise Jensens Fond--
IWT doctoral grant--

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-17
    Type: Initial release
  • Version 1.1: 2018-01-24
    Changes: Structure summary
  • Version 1.2: 2019-07-31
    Changes: Data collection, Database references
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Refinement description