2W62

Saccharomyces cerevisiae Gas2p in complex with laminaripentaose

Summary for 2W62

• Entry DOI: 10.2210/pdb2w62/pdb
• Related: 2W61 2W63
• Descriptor: GLYCOLIPID-ANCHORED SURFACE PROTEIN 2, beta-D-glucopyranose-(1-3)-beta-D-glucopyranose-(1-3)-beta-D-glucopyranose-(1-3)-beta-D-glucopyranose-(1-3)-beta-D-glucopyranose, 1,4-BUTANEDIOL, ... (4 entities in total)
• Functional Keywords: transferase, glycoprotein, cell membrane, fungal cell wall, transglycosylation, glucan, membrane, gpi-anchor, lipoprotein
• Biological source: SACCHAROMYCES CEREVISIAE (BAKER'S YEAST)
• Cellular location: Cell membrane; Lipid-anchor, GPI-anchor (By similarity): Q06135
• Total number of polymer chains: 1
• Total formula weight: 64173.56

Authors

Schuettelkopf, A.W.,Hurtado-Guerrero, R.,van Aalten, D.M.F. (deposition date: 2008-12-16, release date: 2009-01-27, Last modification date: 2024-10-16)

Primary citation

Hurtado-Guerrero, R.,Schuttelkopf, A.W.,Mouyna, I.,Ibrahim, A.F.M.,Shepherd, S.,Fontaine, T.,Latge, J.,Van Aalten, D.M.F.
Molecular Mechanisms of Yeast Cell Wall Glucan Remodeling.
J.Biol.Chem., 284:8461-, 2009

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.

PubMed: 19097997
DOI: 10.1074/JBC.M807990200

Experimental method

X-RAY DIFFRACTION (1.85 Å)