ENGINEERING THE LUXCDABE GENES FROM PHOTORHABDUS-LUMINESCENS TO PROVIDE A BIOLUMINESCENT REPORTER FOR CONSTITUTIVE AND PROMOTER PROBE PLASMIDS AND MINI-TN5 CONSTRUCTS

The luxCDABE operon of Photorhabdus luminescens has been cloned and en gineered as an easily mobilisable cassette flanked by sites for common ly used restriction enzymes. Constitutive and promoter probe plasmids utilising the P. luminescens luxCDABE have been constructed using a nu mber of compatible replicons and antibiotic markers. Complementary to these plasmids, a range of promoterless and constitutive luxCDABE mini -Tn5 derivatives has been constructed. The potential of coupling mini- Tn5 luxCDABE promoter probe transposons with automated luminometry and photometry to screen for mutants that exhibit growth phase variation in gene expression is demonstrated. (C) 1998 Federation of European Mi crobiological Societies. Published by Elsevier Science B.V. All rights reserved.