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1nae

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{{STRUCTURE_1nae| PDB=1nae | SCENE= }}
{{STRUCTURE_1nae| PDB=1nae | SCENE= }}
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'''Structure of CsCBM6-3 from Clostridium stercorarium in complex with xylotriose'''
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===Structure of CsCBM6-3 from Clostridium stercorarium in complex with xylotriose===
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==Overview==
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Carbohydrate-binding polypeptides, including carbohydrate-binding modules (CBMs) from polysaccharidases, and lectins, are widespread in nature. Whilst CBMs are classically considered distinct from lectins, in that they are found appended to polysaccharide-degrading enzymes, this distinction is blurring. The crystal structure of CsCBM6-3, a "sequence-family 6" CBM in a xylanase from Clostridium stercorarium, at 2.3 A reveals a similar, all beta-sheet fold to that from MvX56, a module found in a family 33 glycoside hydrolase sialidase from Micromonospora viridifaciens, and the lectin AAA from Anguilla anguilla. Sequence analysis leads to the classification of MvX56 and AAA into a family distinct from that containing CsCBM6-3. Whilst these polypeptides are similar in structure they have quite different carbohydrate-binding specificities. AAA is known to bind fucose; CsCBM6-3 binds cellulose, xylan and other beta-glucans. Here we demonstrate that MvX56 binds galactose, lactose and sialic acid. Crystal structures of CsCBM6-3 in complex with xylotriose, cellobiose, and laminaribiose, 2.0 A, 1.35 A, and 1.0 A resolution, respectively, reveal that the binding site of CsCBM6-3 resides on the same polypeptide face as for MvX56 and AAA. Subtle differences in the ligand-binding surface give rise to the different specificities and biological activities, further blurring the distinction between classical lectins and CBMs.
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(as it appears on PubMed at http://www.pubmed.gov), where 12634060 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12634060}}
==About this Structure==
==About this Structure==
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[[Category: Xylan]]
[[Category: Xylan]]
[[Category: Xylooligosaccharide]]
[[Category: Xylooligosaccharide]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 16:35:52 2008''

Revision as of 13:35, 27 July 2008

Image:1nae.png

Template:STRUCTURE 1nae

Structure of CsCBM6-3 from Clostridium stercorarium in complex with xylotriose

Template:ABSTRACT PUBMED 12634060

About this Structure

1NAE is a Single protein structure of sequence from Clostridium stercorarium. Full crystallographic information is available from OCA.

Reference

Structure and ligand binding of carbohydrate-binding module CsCBM6-3 reveals similarities with fucose-specific lectins and "galactose-binding" domains., Boraston AB, Notenboom V, Warren RA, Kilburn DG, Rose DR, Davies G, J Mol Biol. 2003 Mar 28;327(3):659-69. PMID:12634060

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