2ihz

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{{STRUCTURE_2ihz| PDB=2ihz | SCENE= }}
{{STRUCTURE_2ihz| PDB=2ihz | SCENE= }}
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'''Crystal structure of multifunctional sialyltransferase from pasteurella multocida with CMP-3F-Neu5Ac and alpha-lactose bound'''
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===Crystal structure of multifunctional sialyltransferase from pasteurella multocida with CMP-3F-Neu5Ac and alpha-lactose bound===
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==Overview==
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Sialyltransferases are key enzymes involved in the biosynthesis of biologically and pathologically important sialic acid-containing molecules in nature. Binary X-ray crystal structures of a multifunctional Pasteurella multocida sialyltransferase (Delta24PmST1) with a donor analogue CMP-3F(a)Neu5Ac or CMP-3F(e)Neu5Ac were determined at 2.0 and 1.9 A resolutions, respectively. Ternary X-ray structures of the protein in complex with CMP or a donor analogue CMP-3F(a)Neu5Ac and an acceptor lactose have been determined at 2.0 and 2.27 A resolutions, respectively. This represents the first sialyltransferase structure and the first GT-B-type glycosyltransferase structure that is bound to both a donor analogue and an acceptor simultaneously. The four structures presented here reveal that binding of the nucleotide-activated donor sugar causes a buried tryptophan to flip out of the protein core to interact with the donor sugar and helps define the acceptor sugar binding site. Additionally, key amino acid residues involved in the catalysis have been identified. Structural and kinetic data support a direct displacement mechanism involving an oxocarbenium ion-like transition state assisted with Asp141 serving as a general base to activate the acceptor hydroxyl group.
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==About this Structure==
==About this Structure==
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[[Category: Sialyltransferase cmp-3f-neu5ac]]
[[Category: Sialyltransferase cmp-3f-neu5ac]]
[[Category: Two rossmann domain]]
[[Category: Two rossmann domain]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 21:51:50 2008''

Revision as of 18:51, 28 July 2008

Image:2ihz.png

Template:STRUCTURE 2ihz

Crystal structure of multifunctional sialyltransferase from pasteurella multocida with CMP-3F-Neu5Ac and alpha-lactose bound

Template:ABSTRACT PUBMED 17487984

About this Structure

2IHZ is a Single protein structure of sequence from Pasteurella multocida. Full crystallographic information is available from OCA.

Reference

Crystal structures of Pasteurella multocida sialyltransferase complexes with acceptor and donor analogues reveal substrate binding sites and catalytic mechanism., Ni L, Chokhawala HA, Cao H, Henning R, Ng L, Huang S, Yu H, Chen X, Fisher AJ, Biochemistry. 2007 May 29;46(21):6288-98. Epub 2007 May 8. PMID:17487984

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