1fgg

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Revision as of 14:46, 12 November 2007

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spinqualitylabelsall models 1fgg, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

CRYSTAL STRUCTURE OF 1,3-GLUCURONYLTRANSFERASE I (GLCAT-I) COMPLEXED WITH GAL-GAL-XYL, UDP, AND MN2+

Overview

Human beta1,3-glucuronyltransferase I (GlcAT-I) is a central enzyme in the, initial steps of proteoglycan synthesis. GlcAT-I transfers a glucuronic, acid moiety from the uridine diphosphate-glucuronic acid (UDP-GlcUA) to, the common linkage region trisaccharide Gal beta 1-3Gal beta 1-4Xyl, covalently bound to a Ser residue at the glycosaminylglycan attachment, site of proteoglycans. We have now determined the crystal structure of, GlcAT-1 at 2.3 A in the presence of the donor substrate product UDP, the, catalytic Mn(2+) ion, and the acceptor substrate analog Gal beta 1-3Gal, beta 1-4Xyl. The enzyme is a alpha/beta protein with two subdomains that, constitute the donor and acceptor substrate binding site. The active site, residues lie in a cleft extending across both subdomains in which the, trisaccharide molecule is oriented perpendicular to the UDP. Residues, Glu(227), Asp(252), and Glu(281) dictate the binding orientation of the, terminal Gal-2 moiety. Residue Glu(281) is in position to function as a, catalytic base by deprotonating the incoming 3-hydroxyl group of the, acceptor. The conserved DXD motif (Asp(194), Asp(195), Asp(196)) has, direct interaction with the ribose of the UDP molecule as well as with the, Mn(2+) ion. The key residues involved in substrate binding and catalysis, are conserved in the glucuronyltransferase family as well as other, glycosyltransferases.

About this Structure

1FGG is a Single protein structure of sequence from Homo sapiens with MN, UDP and UNX as ligands. Full crystallographic information is available from OCA.

Reference

Heparan/chondroitin sulfate biosynthesis. Structure and mechanism of human glucuronyltransferase I., Pedersen LC, Tsuchida K, Kitagawa H, Sugahara K, Darden TA, Negishi M, J Biol Chem. 2000 Nov 3;275(44):34580-5. PMID:10946001

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