Paracoccus suum sp. nov., isolated from a pig farm dust collector.

A Gram-stain-negative, strictly aerobic, non-motile, non-spore-forming, coccoid- or short rod-shaped bacterial strain, designated SC2-6, was isolated from a dust collector of a pig farm located in Wanju-gun, Jeollabuk-do, Republic of Korea. Strain SC2-6 grew within the ranges of 10-37 °C (28-30 °C, optimally), pH 6.0-10.0 (pH 7.0-8.0, optimally) and 0-3% NaCl (w/v). The 16S rRNA gene sequence similarity of strain SC2-6 showed the highest values to Paracoccus kondratievae GBT (96.3%), Paracoccus denitrificans DSM 413 (96.3%) and Paracoccus sanguinis 5503 (96.1%). The phylogenetic tree based on the 16S rRNA gene sequences revealed that strain SC2-6 belonged to the genus Paracoccus and clustered with Paracoccus pacificus F14. The phylogenetic tree based on the rpoD gene sequences also demonstrated that strain SC2-6 fell into the clade of the genus Paracoccus. The DNA G+C content was 66.9 mol%. The major respiratory quinone was ubiquinone-10 and the major fatty acids (> 10% of the total fatty acids) were summed feature 8 (comprising C18 : 1 ω6c and/or C18 : 1 ω7c). The polar lipids were composed of diphosphatidylglycerol, phosphatidylcholine, an unidentified glycolipid, two unidentified aminolipids and two unidentified lipids. On the basis of phenotypic, phylogenetic and genomic data, strain SC2-6 was classified in the genus Paracoccus as a member of a novel species, for which the name Paracoccus suum sp. nov. is proposed. The type strain is SC2-6 (=KACC 19328=NBRC 113110).