Use of TnphoA to enrich for extracellular enzyme mutants of Erwinia carotovora subspecies carotovora |
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Authors: | J C D Hinton G P C Salmond |
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Institution: | Department of Biological Sciences, University of Warwick, Coventry, CV4 7AL, UK. |
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Abstract: | Soft rot Erwinia species secrete a range of enzymes into the extracellular environment. Therefore, the genetically amenable Erwinia system is a useful model for the study of protein secretion by Gram-negative bacteria. We have used a λ-sensitive derivative of Erwinia carotovora subspecies carotovora (Ecc) and the transposon TnphoA, to isolate a range of extracellular enzyme mutants. The use of TnphoA provides an enrichment for extracellular enzyme mutants over other transposon-based systems. In these mutants, the alkaline phosphatase activity of the hybrid protein Is found in the periplasm, and is under the control of the Ecc promoters. Three TnphoA-induced extracellular enzyme mutants were studied in detail. One proved to be an enzyme structural gene mutant, whilst the other two appeared to be secretory mutants. |
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