Two unknown Gram-stain-positive, catalase- and oxidasenegative,
non-motile, and coccus-shaped bacteria, designated
MN-17T and MN-09, were isolated from yaks faeces (Bos
grunniens) in the Qinghai-Tibet Plateau of China. 16S rRNA
gene sequence-based comparative analyses revealed that the
two strains were grouped within the genus Vagococcus, displaying
the highest similarity with Vagococcus xieshaowenii
CGMCC 1.16436T (98.6%) and Vagococcus elongatus CCUG
51432T (96.4%). Both strains grew optimally at 37°C and pH
7.0 in the presence of 0.5% (w/v) NaCl. The complete genome
of MN-17T comprises 2,085 putative genes with a total
of 2,190,262 bp and an average G + C content of 36.7 mol%.
The major fatty acids were C16:0 (31.2%), C14:0 (28.5%), and
C18:1ω9c (13.0%); the predominant respiratory quinone was
MK-7 (68.8%); the peptidoglycan type was A4α(L-Lys-DAsp);
and the major polar lipid was diphosphatidylglycerol.
Together, these supported the affiliation of strain MN-17T
to the genus Vagococcus. In silico DNA-DNA hybridization
and the average nucleotide identity values between MN-17T
and all recognized species in the genus were 21.6–26.1%
and 70.7–83.0%, respectively. MN-17T produced acid from
D-cellobiose, D-fructose, glycerol, D-glucose, N-acetyl-glucosamine,
gentiobiose, D-mannose, D-maltose, D-ribose, Dsaccharose,
salicin, D-trehalose, and D-xylose. These results
distinguished MN-17T and MN-09 from closely related species
in Vagococcus. Thus, we propose that strains MN-17T
and MN-09 represent a novel species in the genus Vagococcus,
with the name Vagococcus zengguangii sp. The type strain
is MN-17T (= CGMCC 1.16726T = GDMCC 1.1589T = JCM
33478T).
Citations
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