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The aprX–lipA operon of Pseudomonas fluorescens B52: a molecular analysis of metalloprotease and lipase production

School of Health Science, Griffith University, PMB 50 Gold Coast Mail Centre, Gold Coast, Qld 4217, Australia¹

Author for correspondence: Ifor R. Beacham. Tel: +61 7 5594 8185. Fax: +61 7 5594 8908. e-mail: i.beacham{at}mailbox.gu.edu.au

Extracellular protease and lipase production by psychrotrophic strains of Pseudomonas fluorescens is repressed by iron and regulated by temperature. The regulation of protease and lipase has been investigated in P. fluorescens B52. Whereas lipase production is increased below the optimum growth temperature (‘low-temperature regulation’), protease production was relatively constant and only decreased above the optimum growth temperature. The genes encoding protease (aprX) and lipase (lipA) are encoded at opposite ends of a contiguous set of genes which also includes protease inhibitor, Type I secretion functions and two autotransporter proteins. Evidence is presented indicating that these genes constitute an operon, with a promoter adjacent to aprX which has been identified by S1 nuclease analysis. The regulation of aprX and lipA has been investigated at the RNA level and using lacZ fusion strains. Whereas the data are consistent with iron regulation at the transcriptional level, a lipA'–'lacZ fusion is not regulated by temperature, suggesting that temperature regulation is post-transcriptional or post-translational. The possibility of regulation at the level of mRNA decay is discussed.

Keywords: Protease, lipase, Pseudomonas fluorescens, promoter, gene regulation

Abbreviations: ECF, extracytoplasmic function

The GenBank accession numbers for the sequences reported in this paper are AF216700, AF216701 and AF216702.

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