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Three heterotrophic, aerobic, brown-pigmented strains, designated P97T, P100 and P104, were isolated from a harbour in the southern North Sea. Phylogenetic analysis of 16S rRNA gene sequences revealed that the isolates are affiliated to the genus Phaeobacter. In silico DNA-DNA hybridization of the genome of strain P97T against those of existing type species indicated that P97T represents a novel species within the genus Phaeobacter, with Phaeobacter inhibens T5T as the closest described organism (29.6 % DNA-DNA relatedness) followed by P. gallaeciensis CIP 105210T (26.4 %). DNA-DNA hybridization demonstrated that the three new strains belong to the same species. The new isolates inhibited Pseudoalteromonas tunicata DSM 14096T, and were Gram-stain-negative, catalase- and oxidase-positive, chemo-organoheterotrophic and motile. Growth occurred at pH 6.5-9.5 (optimum 7.0-8.0) and at 4-30 °C (optimum 20-28 °C). The strains required NaCl for growth. The salinity range was 0.5-6.0 % (w/v) NaCl for P97T and P100, and 0.5-5.0 % for P104, lower than values described for Phaeobacter gallaeciensis and Phaeobacter inhibens. The optimum NaCl concentration for strains P97T and P104 was 2.0-4.0 %, and for P100 was 2.0-3.0 %. Fatty acids (&gt;1 %) comprised 18 : 1ω7c, 16 : 0, 18 : 1 ω7c 11-methyl, 18 : 0, 12 :1, 18 : 2ω7c,12, 10 : 0 3-OH and 12 : 0 3-OH. Polar lipids were phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, an aminolipid, one unknown lipid and one additional unknown lipid in strain P97T. The major respiratory quinone was Q10. Based on phylogenetic and phenotypic differences, the strains represent a novel species in the genus Phaeobacter, for which the name Phaeobacter porticola sp. nov. is proposed. The type strain is P97T (=DSM 103148T=LMG 29594T).

Phaeobacter porticola sp. nov., an antibiotic-producing bacterium isolated from a sea harbour