Summary
Metabolism of sulfonylurea herbicides by Streptomyces griseolus ATCC 11796 is carried out via two cytochromes P-450, P-450SU1 and P-450SU2. Mutants of S. griseolus, selected by their reduced ability to metabolize a fluorescent sulfonylurea, do not synthesize cytochrome P-450SU1 when grown in the presence of sulfonylureas. Genetic evidence indicated that this phenotype was the result of a deletion of > 15 kb of DNA, including the structural genes for cytochrome P-450SU1 and an associated ferredoxin Fd-1 (suaC and suaB, respectively). In the absence of this monooxygenase system, the mutants described here respond to the presence of sulfonylureas or phenobarbital in the growth medium with the expression of only the suhC,B gene products (cytochrome P-450SU2 and Fd-2), previously observed only as minor components in wild-type cells treated with sulfonylurea. These strains have enabled an analysis of sulfonylurea metabolism mediated by cytochrome P-450SU2 in the absence of P-450SU1, yielding an in vivo delineation of the roles of the two different cytochrome P-450 systems in herbicide metabolism by S. griseolus.
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Communicated by J.W. Lengeler
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Harder, P.A., O'Keefe, D.P., Romesser, J.A. et al. Isolation and characterization of Streptomyces griseolus deletion mutants affected in cytochrome P-450-mediated herbicide metabolism. Molec. Gen. Genet. 227, 238–244 (1991). https://doi.org/10.1007/BF00259676
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DOI: https://doi.org/10.1007/BF00259676