Experimental Data Snapshot

  • Resolution: 2.2 Å
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history


Structural mechanism for glycogen phosphorylase control by phosphorylation and AMP.

Barford, D.Hu, S.H.Johnson, L.N.

(1991) J.Mol.Biol. 218: 233-260

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The crystal structures of activated R state glycogen phosphorylase a (GPa) and R and T state glycogen phosphorylase b (GPb) complexed with AMP have been solved at 2.9 A, 2.9 A and 2.2 A resolution, respectively. The structure of R state GPa is nearly ...

    The crystal structures of activated R state glycogen phosphorylase a (GPa) and R and T state glycogen phosphorylase b (GPb) complexed with AMP have been solved at 2.9 A, 2.9 A and 2.2 A resolution, respectively. The structure of R state GPa is nearly identical to the structure of sulphate-activated R state GPb, except in the region of Ser14, where there is a covalently attached phosphate group in GPa and a non-covalently attached sulphate group in GPb. The contacts made by the N-terminal tail residues in R state GPa at the subunit interface of the functionally active dimer are similar to those observed previously for T state GPa. The quaternary and tertiary structural changes on the T to R transition allow these interactions to be relayed to the catalytic site in R state GPa. The transition from the T state GPb structure to the R state GPa structure results in a change in the N-terminal residues from a poorly ordered extended structure that makes intrasubunit contacts to an ordered coiled conformation that makes intersubunit contacts. The distance between Arg10, the first residue to be located from the N terminus, in R state GPa and T state GPb is 50 A. One of the important subunit-subunit interactions in the dimer molecule involves contacts between the helix alpha 2 and the cap' (residues 35' to 45' that form a loop between the 1st and 2nd alpha helices, alpha 1' and alpha 2' of the other subunit. The prime denotes residues from the other subunit). The interactions made by the N-terminal residues induce structural changes at the cap'/alpha 2 helix interface that lead to the creation of a high-affinity AMP site. The tertiary structural changes at the cap (shifts 1.2 to 2.1 A for residues 35 to 45) are partially compensated by the quaternary structural change so that the overall shifts in these residues after the combined tertiary and quaternary changes are between 0.5 and 1.3 A. AMP binds to R state GPb with at least 100-fold greater affinity and exhibits four additional hydrogen bonds, stronger ionic interactions and more extensive van der Waals' interactions with 116 A2 greater solvent accessible surface area buried compared with AMP bound to T state GPb.(ABSTRACT TRUNCATED AT 400 WORDS)

    Related Citations: 
    • The Allosteric Transition of Glycogen Phosphorylase
      Barford, D.,Johnson, L.N.
      (1989) Nature 340: 609
    • Refined Crystal Structure of the Phosphorylase-Heptulose 2-Phosphate-Oligosaccharide-AMP Complex
      Johnson, L.N.,Acharya, K.R.,Jordan, M.D.,Mclaughlin, P.J.
      (1990) J.Mol.Biol. 211: 645
    • Glycogen Phosphorylase B: Description of the Protein Structure 1 1991
      Acharya, K.R.,Stuart, D.I.,Varvill, K.M.,Johnson, L.N.
      () Glycogen Phosphorylase B: Description of the Protein Structure --: --
    • Comparison of the Binding of Glucose and Glucose-1-Phosphate Derivatives to T-State Glycogen Phosphorylase B
      Martin, J.L.,Johnson, L.N.,Withers, S.G.
      (1990) Biochemistry 29: 10745
    • Structural Changes in Glycogen Phosphorylase Induced by Phosphorylation
      Sprang, S.R.,Acharya, K.R.,Goldsmith, E.J.,Stuart, D.I.,Varvill, K.,Fletterick, R.J.,Madsen, N.B.,Johnson, L.N.
      (1988) Nature 336: 215

    Organizational Affiliation

    Laboratory of Molecular Biophysics, University of Oxford, U.K.


Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
842Oryctolagus cuniculusMutation(s): 0 
Gene Names: PYGM
Find proteins for P00489 (Oryctolagus cuniculus)
Go to Gene View: PYGM
Go to UniProtKB:  P00489
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Query on AMP

Download SDF File 
Download CCD File 
C10 H14 N5 O7 P
 Ligand Interaction
Query on PLP

Download SDF File 
Download CCD File 
VITAMIN B6 Phosphate
C8 H10 N O6 P
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
AMPKd: 250000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Resolution: 2.2 Å
  • R-Value Work: 0.206 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 128.500α = 90.00
b = 128.500β = 90.00
c = 116.300γ = 90.00
Software Package:
Software NamePurpose

Structure Validation

View Full Validation Report or Ramachandran Plots

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1992-10-15
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other