Nocardioides jishulii sp. nov.,isolated from faeces of Tibetan gazelle (Procapra picticaudata)

Abstract

Two novel Gram-stain-positive, irregular rod-shaped bacterial strains, dk3136Tand dk3543, were isolated from the faeces of Tibetan gazelle (Procapra picticaudata) in the Qinghai–Tibet Plateau of PR China. The cells were aerobic, oxidase-negative and catalase-positive. Colonies were yellowish, circular without any observable aerial mycelium after culturing at 28 ℃ for 3 days on brain–heart infusion (BHI) agar with 5 % sheep blood. The cells grew optimally at 28 °C, pH 7.5 and with 1 % (w/v) NaCl on BHI agar supplemented with 5 % sheep blood. Phylogenetic analysis of the 16S rRNA gene sequences revealed that their nearest phylogenetic relative wasNocardioides solisilvaeKa25T(97.9 % similarity). The results of 16S rRNA gene sequence and phylogenetic/phylogenomic analyses illustrated thatN. solisilvaeKa25T,Nocardioides gilvusXZ17T,Nocardioides houyundeii78TandNocardioides daphniaeD287Twere their nearest phylogenetic neighbours. The DNA G+C contents of strains dk3136Tand dk3543 were 70.3 mol% and 70.4 mol%, respectively. Their genomes exhibit lower than threshold (95–96 %) average nucleotide identity to known species of the genusNocardioides.ll-2,6-diaminopimelic acid was the diagnostic diamino acid and MK-8(H4) was the predominant respiratory quinone. The major polar lipids were diphosphatidylglycerol and phosphatidylglycerol. The two strains had C18 : 1ω9c,iso-C16 : 0and C17 : 1ω8cas the major fatty acids, and rhamnose and galactose as the main whole-cell sugars. On the basis of the results of our genotypic, phenotypic and biochemical analyses, we conclude that strains dk3136Tand dk3543 represent a novel species in genusNocardioides, for which the nameNocardioides jishuliisp. nov. is proposed. The type strain is dk3136T(=CGMCC 4.7570T=JCM 33496T=KCTC 49314T).