Open AccessThe enzymatic detoxification of the mycotoxin deoxynivalenol: identification of DepA from the DON epimerization pathway
Author(s) -
Carere Jason,
Hassan Yousef I.,
Lepp Dion,
Zhou Ting
Publication year - 2018
Publication title -
microbial biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.287
H-Index - 74
ISSN - 1751-7915
DOI - 10.1111/1751-7915.12874
Subject(s) - epimer , mycotoxin , detoxification (alternative medicine) , enzyme , biotransformation , metabolic pathway , chemistry , biocatalysis , microbial metabolism , biochemistry , biology , stereochemistry , bacteria , food science , reaction mechanism , catalysis , medicine , alternative medicine , pathology , genetics
Summary The biological detoxification of mycotoxins, including deoxynivalenol ( DON ), represents a very promising approach to address the challenging problem of cereal grain contamination. The recent discovery of Devosia mutans 17‐2‐E‐8 ( Devosia spp. 17‐2‐E‐8), a bacterial isolate capable of transforming DON to the non‐toxic stereoisomer 3‐ epi‐ deoxynivalenol, along with earlier reports of bacterial species capable of oxidizing DON to 3 ‐ keto‐ DON , has generated interest in the possible mechanism and enzyme(s) involved. An understanding of these details could pave the way for novel strategies to manage this widely present toxin. It was previously shown that DON epimerization proceeds through a two‐step biocatalysis. Significantly, this report describes the identification of the first enzymatic step in this pathway. The enzyme, a dehydrogenase responsible for the selective oxidation of DON at the C3 position, was shown to readily convert DON to 3‐keto‐ DON , a less toxic intermediate in the DON epimerization pathway. Furthermore, this study provides insights into the PQQ dependence of the enzyme. This enzyme may be part of a feasible strategy for DON mitigation within the near future.