Abstract
Mutants of Photobacterium phosphoreum NCMB7 hypersensitive to several antimicrobiol agents were independently isolated and characterized. The hypersensitivity was probably due to changes in the outer membrane (OM) structure; the electrophoretic lipopolysaccharide profile of one mutant was altered. In addition, 2 mutants exhibited elevated cell surface hydrophobicity. With respect to bioluminescence, the mutants were dim or dark, and showed strongly reduced activities of the inducible enzymes luciferase and fatty acid reductase. Our results suggest that the outer membrane is involved in the regulation of bacterial bioluminescence.
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