Arcobacter marinus sp nov.

A slightly curved, rod-shaped marine bacterium, designated strain CL-S1(T), was isolated from near Dokdo, an island in the East Sea, Korea. Cells were Gram-negative and grew well under either aerobic or microaerobic conditions. Analyses of the 16S rRNA and gyrA gene sequences of strain CL-S1(T) revealed an affiliation with the genus Arcobacter within the class Epsilonproteobacteria. Phylogenetic analyses based on 16S rRNA and gyrA gene sequences showed that strain CL-S1(T) formed a robust clade with Arcobacter halophllus LA31B(T), with sequence similarities of 96.1 and 88.2%, respectively. DNA-DNA relatedness between strain CL-S1(T) and A. halophilus DSM 18005(T) was 44%, indicating that they represent genomically distinct species. Strain CL-S1(T) grew optimally at 30-37 degrees C, at pH 7 and in the presence of 3-5% NaCl. The dominant cellular fatty acids were iso-C-15:0 2-OH and/or C-16:1 omega 7C (28.4%), C-16:0 (26.2%) and C-18:1 omega 7C (22.3%). The DNA G+C content of strain CL-S1(T) was 28 molok. Strain CL-S1(T) differed phenotypically from A. halophilus LA31B(T) based on its ability to grow aerobically at 10 degrees C and inability to grow under anaerobic conditions. Based on the data presented, strain CL-S1(T) is considered to represent a novel species of the genus Arcobacter, for which the name Arcobacter marinus sp. nov. is proposed. The type strain is CL-S1(T) (=KCCM 90072(T) = JCM 15502(T)).