Fliegmann J, Montel E, Djulić A, Cottaz S, Driguez H, Ebel J. Catalytic properties of the bifunctional soybean beta-glucan-binding protein, a member of family 81 glycoside hydrolases.
FEBS Lett 2005;
579:6647-52. [PMID:
16297387 DOI:
10.1016/j.febslet.2005.10.060]
[Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2005] [Revised: 10/28/2005] [Accepted: 10/31/2005] [Indexed: 11/22/2022]
Abstract
The beta-glucan-binding protein (GBP) of soybean (Glycine max L.) has been shown to contain two different activities. As part of the plasma membrane-localized pathogen receptor complex, it binds a microbial cell wall elicitor, triggering the activation of defence responses. Additionally, the GBP is able to hydrolyze beta-1,3-glucans, as present in the cell walls of potential pathogens. The substrate specificity, the mode of action, and the stereochemistry of the catalysis have been elucidated. This defines for the first time the inverting mode of the catalytic mechanism of glycoside hydrolases belonging to family 81.
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