Paeniglutamicibacter terrestris sp. nov., isolated from phenanthrene-degrading consortium enriched from Antarctic...

A novel bacterium, designated strain ANT13_2^T, was isolated from a phenanthrene-degrading consortium enriched from a soil sample collected near the Great Wall Station located in the southwestern area of King George Island, Antarctica. Following a polyphasic taxonomic study, a novel species belonging to the genus Paeniglutamicibacter was described. The strain was a Gram-stain-positive bacterium that exhibited a rod-coccus growth cycle. Strain ANT13_2^T grew aerobically at an optimum temperature of 20-25 °C and at pH 7.0-8.0. Ribose, arabinose and glucose were detected as whole-cell sugars. The predominant menaquinone was MK-9. The diagnostic phospholipids were diphosphatidylglycerol, phosphatidylglycerol and an unidentified phospholipid. The predominant cellular fatty acids were anteiso-C_15 : 0 (67.7 %) and anteiso-C_17 : 0 (11.2 %). The DNA G+C content of the genomic DNA was 60.6 mol%. Based on 16S rRNA gene sequence analysis, strain ANT13_2^T showed the highest similarities to Paeniglutamicibacter antarcticus SPC26^T (98.9 %) followed by Paeniglutamicibacter gangotriensis Lz1y^T (98.4 %), Paeniglutamicibacter sulfureus DSM 20167^T (98.3%) and Paeniglutamicibacter kerguelensis KGN15^T (97.9 %). The average nucleotide identity values between strain ANT13_2^T and the type strains of P. antarcticus SPC26^T and P. gangotriensis Lz1y^T were 73.8 and 77.5 %, respectively, which are well below the 95-96 % species circumscription threshold. On the basis of this polyphasic taxonomic study, strain ANT13_2^T is proposed to represent a novel species to be named Paeniglutamicibacter terrestris sp. nov. The type strain is ANT13_2^T (=TBRC 11756^T=NBRC 114615^T).