Bacterium J217 was isolated from approximately 100 cm below the sediment water interface of the Irish Sea. It is a small, gram-negative, nonmotile rod with a guanine-plus-cytosine content of 67.5 mol%. J217 is an obligate aerobe that is catalase positive and cytochrome oxidase positive. It is nonfermentative, does not hydrolyze complex molecules, and is resistant to seven antibiotics but is susceptible to polymyxin B. Branched-chain amino acids are required for growth; flavine adenine dinucleotide or riboflavine 5'-phosphate and pyridoxal phosphate are necessary cofactors. The temperature, pH, and salinity are narrowly defined with optima at 23°C, pH 7.3, and 36% salinity, respectively. Sodium ions are required for growth and multiplication. Spectral analyses of the yellow, carotenoid pigment produced by J217 are similar to those associated with McMeekin type 2 bacteria. The data presented suggest that J217 be classified as sp. nov.


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