Crystal Structure of Human Glycogenin-1 (GYG1) complexed with manganese, UDP-Glucose and glucose

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Conformational plasticity of glycogenin and its maltosaccharide substrate during glycogen biogenesis.

Chaikuad, A.Froese, D.S.Berridge, G.von Delft, F.Oppermann, U.Yue, W.W.

(2011) Proc Natl Acad Sci U S A 108: 21028-21033

  • DOI: https://doi.org/10.1073/pnas.1113921108
  • Primary Citation of Related Structures:  
    3Q4S, 3QVB, 3RMV, 3RMW, 3T7M, 3T7N, 3T7O, 3U2T, 3U2U, 3U2V, 3U2W

  • PubMed Abstract: 

    Glycogenin initiates the synthesis of a maltosaccharide chain covalently attached to itself on Tyr195 via a stepwise glucosylation reaction, priming glycogen synthesis. We have captured crystallographic snapshots of human glycogenin during its reaction cycle, revealing a dynamic conformational switch between ground and active states mediated by the sugar donor UDP-glucose. This switch includes the ordering of a polypeptide stretch containing Tyr195, and major movement of an approximately 30-residue "lid" segment covering the active site. The rearranged lid guides the nascent maltosaccharide chain into the active site in either an intra- or intersubunit mode dependent upon chain length and steric factors and positions the donor and acceptor sugar groups for catalysis. The Thr83Met mutation, which causes glycogen storage disease XV, is conformationally locked in the ground state and catalytically inactive. Our data highlight the conformational plasticity of glycogenin and coexistence of two modes of glucosylation as integral to its catalytic mechanism.

  • Organizational Affiliation

    Structural Genomics Consortium, Old Road Research Campus Building, Oxford, United Kingdom OX3 7DQ.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
263Homo sapiensMutation(s): 0 
Gene Names: GYGGYG1
UniProt & NIH Common Fund Data Resources
Find proteins for P46976 (Homo sapiens)
Explore P46976 
Go to UniProtKB:  P46976
PHAROS:  P46976
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46976
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on UPG

Download Ideal Coordinates CCD File 
E [auth A],
Q [auth B]
C15 H24 N2 O17 P2
Query on GLC

Download Ideal Coordinates CCD File 
C [auth A]alpha-D-glucopyranose
C6 H12 O6
Query on EDO

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
H [auth A]
I [auth A]
J [auth A]
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
C2 H6 O2
Query on MN

Download Ideal Coordinates CCD File 
D [auth A],
P [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.415α = 79.54
b = 46.59β = 88.75
c = 69.904γ = 75.83
Software Package:
Software NamePurpose
CrystalCleardata collection
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2011-08-31
    Type: Initial release
  • Version 1.1: 2011-12-28
    Changes: Database references
  • Version 1.2: 2012-01-11
    Changes: Database references
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Database references, Derived calculations, Structure summary
  • Version 1.4: 2023-09-13
    Changes: Data collection, Database references, Refinement description, Structure summary