The glucosinolate–myrosinase system. New insights into enzyme–substrate interactions by use of simplified inhibitors
作者:Aurélie Bourderioux、Myriam Lefoix、David Gueyrard、Arnaud Tatibouët、Sylvain Cottaz、Steffi Arzt、Wim P. Burmeister、Patrick Rollin
DOI:10.1039/b502990b
日期:——
Myrosinase, a thioglucoside glucohydrolase, is the only enzyme able to hydrolyse glucosinolates, a unique family of molecules bearing an anomeric O-sulfated thiohydroximate function. Non-hydrolysable myrosinase inhibitors have been devised and studied for their biological interaction. Diverse modifications of the O-sulfate moiety did not result in a significant inhibitory effect, whereas replacing the D-glucopyrano residue by its carba-analogue allowed inhibition to take place. X-Ray experiments carried out after soaking allowed for the first time inclusion of a non-hydrolysable inhibitor inside the enzymatic pocket. Structural tuning of the aglycon part in its pocket is being used as a guide for the development of simplified and more potent inhibitors.
the thiohydroximate function allows an alternative synthetic pathway to glucosinolates. O-Silylated hydroxamicacids were prepared and were then activated with triflicanhydride to generate transient nitrile oxides to be condensed with ethanethiol. The procedure was further applied to the synthesis of naturally occurring glucosinolates.