Crystal Structure of Human Glycogenin-1 (GYG1) complexed with manganese and UDP, in a monoclinic closed form

Experimental Data Snapshot

  • Resolution: 1.98 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.206 

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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
GTEx:  ENSG00000163754 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46976
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.98 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.02α = 90
b = 80.72β = 100.92
c = 69.85γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
MOSFLMdata 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: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description