1v84: Difference between revisions

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[[Image:1v84.gif|left|200px]]
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[[Image:1v84.png|left|200px]]


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{{STRUCTURE_1v84|  PDB=1v84  |  SCENE=  }}  
{{STRUCTURE_1v84|  PDB=1v84  |  SCENE=  }}  


'''Crystal structure of human GlcAT-P in complex with N-acetyllactosamine, Udp, and Mn2+'''
===Crystal structure of human GlcAT-P in complex with N-acetyllactosamine, Udp, and Mn2+===




==Overview==
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The HNK-1 carbohydrate epitope is found on many neural cell adhesion molecules. Its structure is characterized by a terminal sulfated glucuronyl acid. The glucuronyltransferases, GlcAT-P and GlcAT-S, are involved in the biosynthesis of the HNK-1 epitope, GlcAT-P as the major enzyme. We overexpressed and purified the recombinant human GlcAT-P from Escherichia coli. Analysis of its enzymatic activity showed that it catalyzed the transfer reaction for N-acetyllactosamine (Galbeta1-4GlcNAc) but not lacto-N-biose (Galbeta1-3GlcNAc) as an acceptor substrate. Subsequently, we determined the first x-ray crystal structures of human GlcAT-P, in the absence and presence of a donor substrate product UDP, catalytic Mn(2+), and an acceptor substrate analogue N-acetyllactosamine (Galbeta1-4GlcNAc) or an asparagine-linked biantennary nonasaccharide. The asymmetric unit contains two independent molecules. Each molecule is an alpha/beta protein with two regions that constitute the donor and acceptor substrate binding sites. The UDP moiety of donor nucleotide sugar is recognized by conserved amino acid residues including a DXD motif (Asp(195)-Asp(196)-Asp(197)). Other conserved amino acid residues interact with the terminal galactose moiety of the acceptor substrate. In addition, Val(320) and Asn(321), which are located on the C-terminal long loop from a neighboring molecule, and Phe(245) contribute to the interaction with GlcNAc moiety. These three residues play a key role in establishing the acceptor substrate specificity.
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{{ABSTRACT_PUBMED_14993226}}


==About this Structure==
==About this Structure==
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[[Category: Hnk-1 epitope]]
[[Category: Hnk-1 epitope]]
[[Category: Transferase]]
[[Category: Transferase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 12:12:10 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 08:16:45 2008''

Revision as of 05:16, 29 July 2008

File:1v84.png

Template:STRUCTURE 1v84

Crystal structure of human GlcAT-P in complex with N-acetyllactosamine, Udp, and Mn2+

Template:ABSTRACT PUBMED 14993226

About this Structure

1V84 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis for acceptor substrate recognition of a human glucuronyltransferase, GlcAT-P, an enzyme critical in the biosynthesis of the carbohydrate epitope HNK-1., Kakuda S, Shiba T, Ishiguro M, Tagawa H, Oka S, Kajihara Y, Kawasaki T, Wakatsuki S, Kato R, J Biol Chem. 2004 May 21;279(21):22693-703. Epub 2004 Mar 1. PMID:14993226

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