AUTHOR=Angelino Donato , Dosz Edward B. , Sun Jianghao , Hoeflinger Jennifer L. , Van Tassell Maxwell L. , Chen Pei , Harnly James M. , Miller Michael J. , Jeffery Elizabeth H. TITLE=Myrosinase-dependent and –independent formation and control of isothiocyanate products of glucosinolate hydrolysis JOURNAL=Frontiers in Plant Science VOLUME=6 YEAR=2015 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2015.00831 DOI=10.3389/fpls.2015.00831 ISSN=1664-462X ABSTRACT=

Brassicales contain a myrosinase enzyme that hydrolyzes glucosinolates to form toxic isothiocyanates (ITC), as a defense against bacteria, fungi, insects and herbivores including man. Low levels of ITC trigger a host defense system in mammals that protects them against chronic diseases. Because humans typically cook their brassica vegetables, destroying myrosinase, there is a great interest in determining how human microbiota can hydrolyze glucosinolates and release them, to provide the health benefits of ITC. ITC are highly reactive electrophiles, binding reversibly to thiols, but accumulating and causing damage when free thiols are not available. We found that addition of excess thiols released protein-thiol-bound ITC, but that the microbiome supports only poor hydrolysis unless exposed to dietary glucosinolates for a period of days. These findings explain why 3–5 servings a week of brassica vegetables may provide health effects, even if they are cooked.