1uxx

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{{STRUCTURE_1uxx| PDB=1uxx | SCENE= }}
{{STRUCTURE_1uxx| PDB=1uxx | SCENE= }}
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'''CBM6CT FROM CLOSTRIDIUM THERMOCELLUM IN COMPLEX WITH XYLOPENTAOSE'''
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===CBM6CT FROM CLOSTRIDIUM THERMOCELLUM IN COMPLEX WITH XYLOPENTAOSE===
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==Overview==
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Glycoside hydrolases that release fixed carbon from the plant cell wall are of considerable biological and industrial importance. These hydrolases contain non-catalytic carbohydrate binding modules (CBMs) that, by bringing the appended catalytic domain into intimate association with its insoluble substrate, greatly potentiate catalysis. Family 6 CBMs (CBM6) are highly unusual because they contain two distinct clefts (cleft A and cleft B) that potentially can function as binding sites. Henshaw et al. (Henshaw, J., Bolam, D. N., Pires, V. M. R., Czjzek, M., Henrissat, B., Ferreira, L. M. A., Fontes, C. M. G. A., and Gilbert, H. J. (2003) J. Biol. Chem. 279, 21552-21559) show that CmCBM6 contains two binding sites that display both similarities and differences in their ligand specificity. Here we report the crystal structure of CmCBM6 in complex with a variety of ligands that reveals the structural basis for the ligand specificity displayed by this protein. In cleft A the two faces of the terminal sugars of beta-linked oligosaccharides stack against Trp-92 and Tyr-33, whereas the rest of the binding cleft is blocked by Glu-20 and Thr-23, residues that are not present in CBM6 proteins that bind to the internal regions of polysaccharides in cleft A. Cleft B is solvent-exposed and, therefore, able to bind ligands because the loop, which occludes this region in other CBM6 proteins, is much shorter and flexible (lacks a conserved proline) in CmCBM6. Subsites 2 and 3 of cleft B accommodate cellobiose (Glc-beta-1,4-Glc), subsite 4 will bind only to a beta-1,3-linked glucose, whereas subsite 1 can interact with either a beta-1,3- or beta-1,4-linked glucose. These different specificities of the subsites explain how cleft B can accommodate beta-1,4-beta-1,3- or beta-1,3-beta-1,4-linked gluco-configured ligands.
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{{ABSTRACT_PUBMED_15010454}}
==About this Structure==
==About this Structure==
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[[Category: Xylan degradation]]
[[Category: Xylan degradation]]
[[Category: Xylopentaose binding]]
[[Category: Xylopentaose binding]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 12:18:36 2008''

Revision as of 09:18, 29 July 2008

Image:1uxx.png

Template:STRUCTURE 1uxx

CBM6CT FROM CLOSTRIDIUM THERMOCELLUM IN COMPLEX WITH XYLOPENTAOSE

Template:ABSTRACT PUBMED 15010454

About this Structure

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

Reference

The crystal structure of the family 6 carbohydrate binding module from Cellvibrio mixtus endoglucanase 5a in complex with oligosaccharides reveals two distinct binding sites with different ligand specificities., Pires VM, Henshaw JL, Prates JA, Bolam DN, Ferreira LM, Fontes CM, Henrissat B, Planas A, Gilbert HJ, Czjzek M, J Biol Chem. 2004 May 14;279(20):21560-8. Epub 2004 Mar 8. PMID:15010454

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