Differential recognition of plant cell walls by microbial xylan-specific carbohydrate-binding modules

Proceedings of the National Academy of Sciences of the United States of America
Lesley McCartneyJ Paul Knox

Abstract

Glycoside hydrolases that degrade plant cell walls have complex molecular architectures in which one or more catalytic modules are appended to noncatalytic carbohydrate-binding modules (CBMs). CBMs promote binding to polysaccharides and potentiate enzymic hydrolysis. Although there are diverse sequence-based families of xylan-binding CBMs, these modules, in general, recognize both decorated and unsubstituted forms of the target polysaccharide, and thus the evolutionary rationale for this diversity is unclear. Using immunohistochemistry to interrogate the specificity of six xylan-binding CBMs for their target polysaccharides in cell walls has revealed considerable differences in the recognition of plant materials between these protein modules. Family 2b and 15 CBMs bind to xylan in secondary cell walls in a range of dicotyledon species, whereas family 4, 6, and 22 CBMs display a more limited capability to bind to secondary cell walls. A family 35 CBM, which displays more restricted ligand specificity against purified xylans than the other five protein modules, reveals a highly distinctive binding pattern to plant material including the recognition of primary cell walls of certain dicotyledons, a feature shared with CBM15. Differ...Continue Reading

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Citations

Nov 13, 2009·Applied Microbiology and Biotechnology·Daniel GuillénRomina Rodríguez-Sanoja
May 13, 2011·Journal of Agricultural and Food Chemistry·Emmie DornezChristophe M Courtin
Sep 20, 2008·Chemical Communications : Chem Comm·Nicolas LaurentSabine L Flitsch
Feb 17, 2009·Proceedings of the National Academy of Sciences of the United States of America·Cedric MontanierHarry J Gilbert
Aug 11, 2010·Proceedings of the National Academy of Sciences of the United States of America·Cécile HervéJ Paul Knox
Aug 16, 2012·Proceedings of the National Academy of Sciences of the United States of America·Breeanna R UrbanowiczWilliam S York
Jul 28, 2010·The Journal of Biological Chemistry·Cedric MontanierHarry J Gilbert
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