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. 1993 Jul;59(7):2007–2013. doi: 10.1128/aem.59.7.2007-2013.1993

Purification and preliminary characterization of permethrinase from a pyrethroid-transforming strain of Bacillus cereus.

S E Maloney 1, A Maule 1, A R Smith 1
PMCID: PMC182228  PMID: 8357241

Abstract

Bacillus cereus SM3 was isolated on a mineral salts medium with Tween 80 as the primary carbon source. It was able to hydrolyze second- and third-generation pyrethroids, thereby generating noninsecticidal products. The enzyme responsible for this hydrolytic reaction was named permethrinase for this study. This is the first instance in which pyrethroid detoxification has been achieved with a cell-free microbial enzyme system. Permethrinase was purified by ion-exchange chromatography and gel filtration chromatography. The molecular mass of native permethrinase was 61 +/- 3 kDa, as estimated by Sephadex G-100 gel filtration. This novel microbial esterase seems to be a carboxylesterase. Permethrinase activity had an optimum pH of 7.5 and a temperature optimum of 37 degrees C. No cofactors or coenzymes were required for permethrinase activity. The enzyme may be a serine esterase, as it seems to be sensitive to the organophosphorus compound tetraethylpyrophosphate at concentrations in the micromolar range. Addition of dithiothreitol afforded permethrinase protection against the inhibitory effects of the sulfydryl agents p-chloromercuribenzoate and N-ethylmaleimide. The enzyme was stable over a range of temperatures. Cell extracts of strain SM3 also contained another esterase, which was active towards beta-naphthylacetate, but this enzyme was distinct from permethrinase.

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Selected References

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