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Mycosphaerella graminicola (Zymoseptoria tritici ) is an ascomycete filamentous fungus that causes Septoria leaf blotch in wheat crops. In Europe the most widely used fungicides for this major disease are demethylation inhibitors (DMIs). Their target is the essential sterol 14α-demethylase (CYP51), which requires cytochrome P450 reductase (CPR) as its redox partner for functional activity. TheM. graminicola CPR (MgCPR) is able to catalyze the sterol 14α-demethylation of eburicol and lanosterol when partnered withCandida albicans CYP51 (CaCYP51) and that of eburicol only withM. graminicola CYP51 (MgCYP51). The availability of the functionalin vivo redox partner enabled thein vitro catalytic activity of MgCYP51 to be demonstrated for the first time. MgCYP51 50% inhibitory concentration (IC50 ) studies with epoxiconazole, tebuconazole, triadimenol, and prothioconazole-desthio confirmed that MgCYP51 bound these azole inhibitors tightly. The characterization of the MgCPR/MgCYP51 redox pairing has produced a functional method to evaluate the effects of agricultural azole fungicides, has demonstrated eburicol specificity in the activity observed, and supports the conclusion that prothioconazole is a profungicide.

applied and environmental microbiology

Novel Substrate Specificity and Temperature-Sensitive Activity of Mycosphaerella graminicola CYP51 Supported by the Native NADPH Cytochrome P450 Reductase