Taxonomic, metabolic traits and species description of aromatic compound degrading Indian soil bacterium CSV86.

A soil bacterium, strain CSV86 isolated from a petrol station in Bangalore, India displays a unique carbon source utilization hierarchy with preferential utilization of various genotoxic aromatic compounds over glucose. Cells were Gram-negative, motile rods, oxidase- and catalase-positive. Strain CSV86 possess a 6.79 Mb genome with 62.72 G + C mol%. 16S rRNA gene phylogeny relates strain CSV86 to the genus , with highest similarity to WL (99.38%). Multi-locus sequence analyses of B-B-D-A and 33 ribosomal proteins () displayed overall low similarities to its phylogenetic relatives with poor similarity score (6%). Average nucleotide identity (ANI) and DNA-DNA hybridization (DDH) showed poor (87.11% and 33.2%, respectively) genomic relatedness of strain CSV86 to its closest relatives, indicating genomic distinctiveness. The major cellular fatty acids were 16:0, 17:0cyclo, summed-feature-3 (16:1ω7c/16:1ω6c) and -8 (18:1ω7c). Further, differential abundance of 12:0, 10:0 3-OH and 12:0 3-OH and phenotypic differences distinguished strain CSV86 from closest relatives, hence designated as . The unique aromatic degradation ability, resistance to heavy metals, efficient nitrogen-sulfur assimilation, beneficial eco-physiological traits (production of indole acetic acid, siderophore and fusaric acid efflux) and plasmid-free genome suggest strain CSV86 to be a model organism for bioremediation and ideal host for metabolic engineering.