Description of Naumannella cuiyingiana sp. nov., isolated from a ca. 1500-year-old mural painting, and emended description of the genus Naumannella.

Abstract

Strain AFT2T was isolated from a mural painting sample from a ca. 1500-year-old tomb located in Shanxi Province, China. The isolate was a Gram-stain-positive, non-motile, non-spore-forming, aerobic and oval to short-rod-shaped bacterium that formed white-pigmented colonies. Phylogenetic analyses based on 16S rRNA gene sequence revealed that strain AFT2T was most closely (97.01 %) correlated and formed a monophyletic clade with Naumannella halotolerans WS4616T (=DSM 24323T). The G+C content of the genomic DNA was 71.97 mol%, and the strain showed 37.27 % DNA-DNA relatedness to N. halotolerans DSM 24323T. The major cellular fatty acid was anteiso-C15 : 0 (55.32 %), and MK-9(H4) was the only respiratory quinone. The polar lipids comprised phosphatidylglycerol, diphosphatidylglycerol, two unknown phospholipids and five unknown glycolipids. ll-Diaminopimelic acid was detected in the cell-wall peptidoglycan (type A3γ), and the whole-cell sugars consisted of ribose, mannose, arabinose and galactose. On the basis of its phenotypic and phylogenetic characteristics, it is proposed that strain AFT2T should be classified as a representative of a novel species of the genus Naumannella, for which the name Naumannella cuiyingiana sp. nov. is proposed. The type strain is AFT2T (=CCTCC AB 2015428T=DSM 103164T).