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Microbiology 149 (2003), 2679-2686; DOI  10.1099/mic.0.26524-0
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Microbiology 149 (2003), 2679-2686; DOI  10.1099/mic.0.26524-0
© 2003 Society for General Microbiology

Marinomonas mediterranea is a lysogenic bacterium that synthesizes R-bodies

Diana Hernández-Romero1, Patricia Lucas-Elío1, Daniel López-Serrano2, Francisco Solano2 and Antonio Sanchez-Amat1

1 Department of Genetics and Microbiology, University of Murcia, 30100 Murcia, Spain
2 Department of Biochemistry and Molecular Biology B, University of Murcia, 30100 Murcia, Spain

Correspondence
Antonio Sanchez-Amat
antonio{at}um.es

The melanogenic marine bacterium Marinomonas mediterranea 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, M. mediterranea 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 ppoS 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.

Abbreviations: DMPO, dimethoxyphenol oxidase; DOPA, 3,4-dihydroxyphenylalanine; DO, DOPA oxidase; DOSDS, DO activated by SDS; PPO, polyphenol oxidase; SST, Tris-buffered saline solution; TEM, transmission electron microscopy; TH, tyrosine hydroxylase; THSDS, TH activated by SDS




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