title: Antibiotic production by the marine photosynthetic bacterium Chromatium purpuratum NKPB 031704: localization of activity to the chromatophores.
abstract: Over 200 strains of marine purple photosynthetic bacteria were isolated. Two strains showed antibiotic activity towards Saccharomyces cerevisiae and were tentatively identified as Chromatium purpuratum. Crude antibiotic, prepared by solvent extraction, showed a broad antimicrobial spectrum. The highest activity was found in the chromatophore fraction. Chromatographic separation of purified light harvesting complex from one strain, NKPB 031704, showed the presence of two separate pigmented compounds which were responsible for antimicrobial activity. Our findings reveal the unexpected ability of photosynthetic bacteria to produce broad spectrum antibiotics. In addition, this is the first example of intracellular localization of antibiotic activity in a marine bacterium.
authors.affiliation: Department of Biotechnology, Tokyo University of Agriculture and Technology, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Grant Burgess
authors.forename: H
authors.initials: H
authors.lastname: Miyashita
authors.forename: H
authors.initials: H
authors.lastname: Sudo
authors.forename: T
authors.initials: T
authors.lastname: Matsunaga
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis* / Q000494:pharmacology; D000935:Antifungal Agents / Q000096:biosynthesis / Q000494:pharmacology; D002844:Chromatium / Q000737:chemistry / Q000378:metabolism*; D004353:Drug Evaluation, Preclinical; D004926:Escherichia coli / Q000187:drug effects; D007779:Lactobacillus acidophilus / Q000187:drug effects; D009792:Oceans and Seas; D012441:Saccharomyces cerevisiae / Q000187:drug effects; D013347:Subcellular Fractions / Q000737:chemistry*; D014871:Water Microbiology
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents