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• W1885123225 abstract "The defensive function of the glucosinolate-myrosinase system in plants of the order Capparales results from the formation of isothiocyanates when glucosinolates are hydrolysed by myrosinases upon tissue damage. In some glucosinolate-containing plant species, as well as in the insect herbivore Pieris rapae, protein factors alter the outcome of myrosinase-catalysed glucosinolate hydrolysis, leading to the formation of products other than isothiocyanates. To date, two such proteins have been identified at the molecular level, the epithiospecifier protein (ESP) from Arabidopsis thaliana and the nitrile-specifier protein (NSP) from P. rapae. These proteins share no sequence similarity although they both promote the formation of nitriles. To understand the biochemical bases of nitrile formation, we compared some of the properties of these proteins using purified preparations. We show that both proteins appear to be true enzymes rather than allosteric cofactors of myrosinases, based on their substrate and product specificities and the fact that the proportion of glucosinolates hydrolysed to nitriles does not remain constant when myrosinase activity varies. No stable association between ESP and myrosinase could be demonstrated during affinity chromatography, nevertheless some proximity of ESP to myrosinase is required for epithionitrile formation to occur, as evidenced by the lack of ESP activity when it was spatially separated from myrosinase in a dialysis chamber. The significant difference in substrate- and product specificities between A. thaliana ESP and P. rapae NSP is consonant with their different ecological functions. Furthermore, ESP and NSP differ remarkably in their requirements for metal ion cofactors. We found no indications of the involvement of a free radical mechanism in epithionitrile formation by ESP as suggested in earlier reports." @default.
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• W1885123225 date "2006-05-08" @default.
• W1885123225 modified "2023-10-17" @default.
• W1885123225 title "Comparative biochemical characterization of nitrile-forming proteins from plants and insects that alter myrosinase-catalysed hydrolysis of glucosinolates" @default.
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• W1885123225 doi "https://doi.org/10.1111/j.1742-4658.2006.05252.x" @default.
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