4KYT

The structure of superinhibitory phospholamban bound to the calcium pump SERCA1a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.833 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.239 

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:  

  • 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 f ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SERCA1a
A
994Oryctolagus cuniculusMutation(s): 0 
Gene Names: ATP2A1
EC: 7.2.2.10
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
P-type ATPase
Protein: 
Calcium ATPase; rabbit sarcoplasmic reticulum. E1 state with bound calcium
Find proteins for P04191 (Oryctolagus cuniculus)
Go to Gene View: ATP2A1
Go to UniProtKB:  P04191
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cardiac phospholamban
B, C
52Canis lupus familiarisMutation(s): 4 
Gene Names: PLN
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
P-type ATPase
Protein: 
Calcium ATPase; rabbit sarcoplasmic reticulum. E1 state with bound calcium
Find proteins for P61012 (Canis lupus familiaris)
Go to Gene View: PLN
Go to UniProtKB:  P61012
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
MAL
Query on MAL

Download SDF File 
Download CCD File 
A
MALTOSE
C12 H22 O11
GUBGYTABKSRVRQ-ASMJPISFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.833 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.239 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 61.591α = 90.00
b = 93.094β = 90.00
c = 316.375γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-3000data reduction
HKL-3000data collection
HKL-3000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2013-10-09
    Type: Database references
  • Version 1.2: 2013-11-13
    Type: Database references