1887

Abstract

The melanogenic marine bacterium synthesizes R-bodies as revealed by transmission electron microscopy. These structures were previously described in some obligate symbionts of paramecia and some free-living bacteria, none of which was isolated from sea water. In other micro-organisms, the synthesis of R-bodies has been related to extrachromosomal elements. Accordingly, induction by mitomycin C or UV radiation resulted in the production of defective phages resembling bacteriocins, indicating that it is a lysogenic bacterium. Two mitomycin-C-resistant strains defective in prophage replication have been isolated. These mutants, and the previously obtained strains ngC1, T102 and T103, the latter mutated in the gene encoding a sensor histidine kinase, are affected not only in phage replication but also in polyphenol oxidase activities and melanin synthesis, suggesting a relationship between the control of all these processes.

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2003-09-01
2019-11-16
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