Abstract

A Gram-negative, non-motile bacterium, designated KSL5401-037T, was isolated from a sewage treatment plant in Gwangju in the Republic of Korea and was characterized using a polyphasic taxonomic approach. Comparative 16S rRNA gene sequence analysis showed that strain KSL5401-037T belonged to the genus Acinetobacter in the family Moraxellaceae of the Gammaproteobacteria (Brisou and Prevot, 1954). According to a 16S rRNA gene sequence analysis, it was closely related to Acinetobacter johnsonii ATCC 17909T (97.3%), A. bouvetii 4B02T (97.2%), and A. beijerinckii 58aT (96.8%). Chemotaxonomic data revealed that strain KSL5401- 037T possesses an ubiquinone system with Q-8 as the predominant compound and C16:0 (19.2%), C18:1 w9c (19.5%), and summed feature 3 (C16:1 w6c / C16:1 w7c, 34.1%) as the predominant cellular fatty acids. The major polar lipids detected in strain KSL5401-037T were diphosphatidylglycerol (DPG) and, phosphatidylethanolamine (PE), followed by phosphatidylglycerol (PG) and moderate amounts of phosphatidylcholine and phosphatidylserine. The G+C content of the genomic DNA was 41.2-42.1 mol%. Strain KSL5401-037T exhibited relatively low levels of DNA-DNA relatedness with respect to A. johnsonii DSM 6963T (17.7%) and A. bouvetii 4B02T (9.3%). The DNA-DNA relatedness values, biochemical, and physiological characteristics of strain KSL5401-037T strongly support its genotypic and phenotypic differentiation from other recognized type strains of the genus Acinetobacter. Based on these data, strain KSL5401-037T (JCM 17071T =KEMC 5401- 037T) should be classified in the genus Acinetobacter as a type strain of novel species, for which the name Acinetobacter kyonggiensis sp. nov. is proposed.

• Keywords: Acinetobacter kyonggiensis; taxonomy