Saccharomyces cerevisiae Gas2p apostructure (E176Q mutant)

Experimental Data Snapshot

  • Resolution: 1.62 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.176 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Molecular Mechanisms of Yeast Cell Wall Glucan Remodeling.

Hurtado-Guerrero, R.Schuttelkopf, A.W.Mouyna, I.Ibrahim, A.F.M.Shepherd, S.Fontaine, T.Latge, J.Van Aalten, D.M.F.

(2009) J Biol Chem 284: 8461

  • DOI: https://doi.org/10.1074/jbc.M807990200
  • Primary Citation of Related Structures:  
    2W61, 2W62, 2W63

  • PubMed Abstract: 

    Yeast cell wall remodeling is controlled by the equilibrium between glycoside hydrolases, glycosyltransferases, and transglycosylases. Family 72 glycoside hydrolases (GH72) are ubiquitous in fungal organisms and are known to possess significant transglycosylase activity, producing elongated beta(1-3) glucan chains. However, the molecular mechanisms that control the balance between hydrolysis and transglycosylation in these enzymes are not understood. Here we present the first crystal structure of a glucan transglycosylase, Saccharomyces cerevisiae Gas2 (ScGas2), revealing a multidomain fold, with a (betaalpha)(8) catalytic core and a separate glucan binding domain with an elongated, conserved glucan binding groove. Structures of ScGas2 complexes with different beta-glucan substrate/product oligosaccharides provide "snapshots" of substrate binding and hydrolysis/transglycosylation giving the first insights into the mechanisms these enzymes employ to drive beta(1-3) glucan elongation. Together with mutagenesis and analysis of reaction products, the structures suggest a "base occlusion" mechanism through which these enzymes protect the covalent protein-enzyme intermediate from a water nucleophile, thus controlling the balance between hydrolysis and transglycosylation and driving the elongation of beta(1-3) glucan chains in the yeast cell wall.

  • Organizational Affiliation

    Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, United Kingdom. R.Hurtadoguerrero@dundee.ac.uk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GLYCOLIPID-ANCHORED SURFACE PROTEIN 2555Saccharomyces cerevisiaeMutation(s): 1 
EC: 2.4.1
Membrane Entity: Yes 
Find proteins for Q06135 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q06135 
Go to UniProtKB:  Q06135
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ06135
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.62 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.883α = 90
b = 64.479β = 90
c = 152.038γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2024-05-01
    Changes: Data collection, Database references, Other, Refinement description