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Family 6 carbohydrate-binding modules display multiple beta 1,3-linked glucan-specific binding interfaces

Lookup NU author(s): Emeritus Professor Harry Gilbert, Dr David Bolam

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Abstract

Noncatalytic carbohydrate-binding modules (CBMs), which are found in a variety of carbohydrate-degrading enzymes, have been grouped into sequence-based families. CBMs, by recruiting their appended enzymes onto the surface of the target substrate, potentiate catalysis particularly against insoluble substrates. Family 6 CBMs (CBM6s) display unusual properties in that they present two potential ligand-binding sites termed clefts A and B, respectively. Cleft B is located on the concave surface of the beta-sandwich fold while cleft A, the more common binding site, is formed by the loops that connect the inner and the outer beta-sheets. Here, we report the biochemical properties of CBM6-1 from Cellvibrio mixtus CmCel5A. The data reveal that CBM6-1 specifically recognizes beta 1,3-glucans through residues located both in cleft A and in cleft B. In contrast, a previous report showed that a CBM6 derived from a Bacillus halodurans laminarinase binds to beta 1,3-glucans only in cleft A. These studies reveal a different mechanism by which a highly conserved protein platform can recognize beta 1,3-glucans.

Publication metadata

Author(s): Correia MAS, Pires VMR, Gilbert HJ, Bolam DN, Fernandes VO, Alves VD, Prates JAM, Ferreira LMA, Fontes CMGA

Publication type: Article

Publication status: Published

Journal: FEMS Microbiology Letters

Year: 2009

Volume: 300

Issue: 1

Pages: 48-57

ISSN (print): 0378-1097

ISSN (electronic): 1574-6968

Publisher: Wiley-Blackwell Publishing Ltd.

URL: http://dx.doi.org/10.1111/j.1574-6968.2009.01764.x

DOI: 10.1111/j.1574-6968.2009.01764.x

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