1887

Abstract

A Gram-stain-positive, non-spore-forming, catalase-positive and facultatively anaerobic coccus, designated ZY16052, was isolated from mesenteric lymph nodes of a sick piglet in Kunming, Yunnan Province, PR China and its taxonomic position was studied by following a polyphasic approach. Optimal growth was observed at 37 °C, pH 8.0 and 2 % NaCl (w/v) on Columbia agar. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain ZY16052 formed a separated evolutionary lineage from recognized genera of the family Aerococcaceae and shared low similarity to its closest related species Facklamia sourekii (93.8 %) and Ignavigranum ruoffiae (93.4 %). Phylogenetic analysis based on the housekeeping gene recA indicated that strain ZY16052 represented a deep and distinct evolutionary lineage, and was well separated from all genera in the family Aerococcaceae , with very low sequence similarity(≤73.2 %). Sequence analysis based on the housekeeping gene rpoA indicated that strain ZY16052 shared very low similarity ≤77.0 % to related genera. The genomic OrthoANI values between strain ZY16052 and type species of related genera in the family Aerococcaceae and species in the genus Facklamia were ≤67.77 and ≤68.11 %, respectively. The genomic G+C content was 42.3 mol%. The predominant fatty acids (>5 %) were C16 : 0, C18 : 1ω9c, C14 : 0 and summed feature 5 (C18 : 2ω6,9c and/or C18 : 0 ante). The major polar lipids were digalactosyldiacylglycerol, phosphatidylglycerol, diacylglycerols, triacylglycerol and phosphatidic acid. The peptidoglycan contained the amino acids lysine, glycine, alanine and glutamic acid, which is characteristic of peptidoglycan type A1a. Based on the phylogenetic and phenotypic evidence, we propose that the unknown bacterium be classified as Suicoccus acidiformans gen. nov., sp. nov. The type strain of Suicoccus acidiformans is ZY16052 (=CCTCC AB 2017017=DSM 105755).

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2019-03-18
2019-09-22
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