2C8K

Crystal Structure of (SR) Calcium-ATPase E2(Tg) with partially occupied AMPPCP site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.252 
  • R-Value Observed: 0.252 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Modulatory and Catalytic Modes of ATP Binding by the Calcium Pump

Jensen, A.M.Sorensen, T.L.Olesen, C.Moller, J.V.Nissen, P.

(2006) EMBO J 25: 2305

  • DOI: 10.1038/sj.emboj.7601135
  • Primary Citation of Related Structures:  
    2C88, 2C8L, 2C8K, 2C9M

  • PubMed Abstract: 
  • We present crystal structures of the calcium-free E2 state of the sarcoplasmic reticulum Ca2+ -ATPase, stabilized by the inhibitor thapsigargin and the ATP analog AMPPCP. The structures allow us to describe the ATP binding site in a modulatory mode uncou ...

    We present crystal structures of the calcium-free E2 state of the sarcoplasmic reticulum Ca2+ -ATPase, stabilized by the inhibitor thapsigargin and the ATP analog AMPPCP. The structures allow us to describe the ATP binding site in a modulatory mode uncoupled from the Asp351 phosphorylation site. The Glu439 side chain interacts with AMPPCP via an Mg2+ ion in accordance with previous Fe2+ -cleavage studies implicating this residue in the ATPase cycle and in magnesium binding. Functional data on Ca2+ mediated activation indicate that the crystallized state represents an initial stage of ATP modulated deprotonation of E2, preceding the binding of Ca2+ ions in the membrane from the cytoplasmic side. We propose a mechanism of Ca2+ activation of phosphorylation leading directly from the compact E2-ATP form to the Ca2E1-ATP state. In addition, a role of Glu439 in ATP modulation of other steps of the functional cycle is suggested.


    Organizational Affiliation

    Department of Molecular Biology, Aarhus University, Denmark.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ARCOPLASMIC/ENDOPLASMIC RETICULUM CALCIUM ATPASE 1 A994Oryctolagus cuniculusMutation(s): 0 
Gene Names: ATP2A1
EC: 3.6.3.8 (PDB Primary Data), 7.2.2.10 (UniProt)
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
P-type ATPase
Protein: 
Calcium ATPase; rabbit sarcoplamic reticulum. Ca2+-free E2 state with thapsigargin and AMPPCP
Find proteins for P04191 (Oryctolagus cuniculus)
Explore P04191 
Go to UniProtKB:  P04191
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TG1
Query on TG1

Download Ideal Coordinates CCD File 
A
OCTANOIC ACID [3S-[3ALPHA, 3ABETA, 4ALPHA, 6BETA, 6ABETA, 7BETA, 8ALPHA(Z), 9BALPHA]]-6-(ACETYLOXY)-2,3,-3A,4,5,6,6A,7,8,9B-DECAHYDRO-3,3A-DIHYDROXY-3,6,9-TRIMETHYL-8-[(2-METHYL-1-OXO-2-BUTENYL)OX Y]-2-OXO-4-(1-OXOBUTOXY)-AZULENO[4,5-B]FURAN-7-YL ESTER
C34 H50 O12
IXFPJGBNCFXKPI-FSIHEZPISA-N
 Ligand Interaction
ACP
Query on ACP

Download Ideal Coordinates CCD File 
A
PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER
C11 H18 N5 O12 P3
UFZTZBNSLXELAL-IOSLPCCCSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TG1Kd:  0.20000000298023224   nM  BindingDB
TG1Ki:  0.10000000149011612   nM  BindingDB
TG1IC50:  0.20000000298023224   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.252 
  • R-Value Observed: 0.252 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.34α = 90
b = 71.34β = 90
c = 587.99γ = 90
Software Package:
Software NamePurpose
CNSrefinement
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-06-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance