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Environmental Microbiology |
Microbiology Department, National University of Ireland, Cork, Ireland1
Department of Industrial Microbiology, National University of Ireland, Dublin, Ireland2
Institut für Biotechnologie, ETH Hönggerberg, CH-8093 Zurich, Switzerland3
Author for correspondence: Alan D. W. Dobson. Tel: +353 21 4902743. Fax: +353 21 4903101. e-mail: a.dobson{at}ucc.ie
The styrene degradative pathway in Pseudmonas putida CA-3 has previously been shown to be divided into an upper pathway involving the conversion of styrene to phenylacetic acid and a lower pathway for the subsequent degradation of phenylacetic acid. It is reported here that expression of the regulatory genes styS and styR is essential for transcription of the upper pathway, but not for degradation of the lower pathway inducer, phenylacetic acid. The presence of phenylacetic acid in the growth medium completely repressed the upper pathway enzymes even in the presence of styrene, the upper pathway inducer. This repression is mediated at the transcription level by preventing expression of the styS and styR regulatory genes. Finally, an examination was made of the various stages of the diauxic growth curve obtained when P. putida CA-3 was grown on styrene together with an additional carbon source and it is reported that catabolite repression may involve a different mechanism to transcriptional repression by an additional carbon source.
Keywords: Pseudomonas putida, styrene, induction, catabolite repression
Abbreviations: PAA, phenylacetic acid; PACoA, phenylacetate–CoA; SMO, styrene monooxygenase
The GenBank accession number for the sequence determined in this work is AF257095.
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