4Y3U

The structure of phospholamban bound to the calcium pump SERCA1a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.51 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The structural basis for phospholamban inhibition of the calcium pump in sarcoplasmic reticulum.

Akin, B.L.Hurley, T.D.Chen, Z.Jones, L.R.

(2013) J Biol Chem 288: 30181-30191

  • DOI: 10.1074/jbc.M113.501585
  • Primary Citation of Related Structures:  
    4KYT, 4Y3U

  • PubMed Abstract: 
  • P-type ATPases are a large family of enzymes that actively transport ions across biological membranes by interconverting between high (E1) and low (E2) ion-affinity states; these transmembrane transporters carry out critical processes in nearly all forms of life ...

    P-type ATPases are a large family of enzymes that actively transport ions across biological membranes by interconverting between high (E1) and low (E2) ion-affinity states; these transmembrane transporters carry out critical processes in nearly all forms of life. In striated muscle, the archetype P-type ATPase, SERCA (sarco(endo)plasmic reticulum Ca(2+)-ATPase), pumps contractile-dependent Ca(2+) ions into the lumen of sarcoplasmic reticulum, which initiates myocyte relaxation and refills the sarcoplasmic reticulum in preparation for the next contraction. In cardiac muscle, SERCA is regulated by phospholamban (PLB), a small inhibitory phosphoprotein that decreases the Ca(2+) affinity of SERCA and attenuates contractile strength. cAMP-dependent phosphorylation of PLB reverses Ca(2+)-ATPase inhibition with powerful contractile effects. Here we present the long sought crystal structure of the PLB-SERCA complex at 2.8-Å resolution. The structure was solved in the absence of Ca(2+) in a novel detergent system employing alkyl mannosides. The structure shows PLB bound to a previously undescribed conformation of SERCA in which the Ca(2+) binding sites are collapsed and devoid of divalent cations (E2-PLB). This new structure represents one of the key unsolved conformational states of SERCA and provides a structural explanation for how dephosphorylated PLB decreases Ca(2+) affinity and depresses cardiac contractility.


    Organizational Affiliation

    From the Krannert Institute of Cardiology and the Departments of Medicine and.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sarcoplasmic/endoplasmic reticulum calcium ATPase 1A994Oryctolagus cuniculusMutation(s): 0 
Gene Names: ATP2A1
EC: 3.6.3.8 (PDB Primary Data), 7.2.2.10 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for P04191 (Oryctolagus cuniculus)
Explore P04191 
Go to UniProtKB:  P04191
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cardiac phospholambanB50Canis lupus familiarisMutation(s): 0 
Gene Names: PLN
Membrane Entity: Yes 
UniProt
Find proteins for P61012 (Canis lupus familiaris)
Explore P61012 
Go to UniProtKB:  P61012
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Cardiac phospholambanC23Canis lupus familiarisMutation(s): 0 
Gene Names: PLN
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download Ideal Coordinates CCD File 
D [auth A]POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.51 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.745α = 90
b = 91.825β = 90
c = 316.256γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data reduction
HKL-3000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2015-02-10 
  • Released Date: 2015-02-25 
  • Deposition Author(s): Hurley, T.D.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesR37-HL049428

Revision History  (Full details and data files)

  • Version 1.0: 2015-02-25
    Type: Initial release
  • Version 1.1: 2017-09-20
    Changes: Author supporting evidence, Derived calculations, Source and taxonomy
  • Version 1.2: 2019-12-04
    Changes: Author supporting evidence