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Authors: Lim, Yun Kyong and Park, Soon-Nang and Shin, Jeong Hwan and Chang, Young-Hyo and Shin, Yeseul and Paek, Jayoung and Kim, Hongik and Kook, Joong-Ki

A novel facultative anaerobic and Gram-stain-positive coccus, designated strain ChDC F135T, was isolated from human subgingival dental plaque of periodontitis lesion and was characterized by polyphasic taxonomic analysis. The 16S rRNA gene (16S rDNA) sequence of strain ChDC F135T was closest to that of Streptococcus sinensis HKU4T (98.2%), followed by Streptococcus intermedia SK54T (97.0%), Streptococcus constellatus NCTC11325T (96.0%), and Streptococcus anginosus NCTC 10713T (95.7%). In contrast, phylogenetic analysis based on the superoxide dismutase gene (sodA) and the RNA polymerase beta-subunit gene (rpoB) showed that the nucleotide sequence similarities of strain ChDC F135T were highly similar to the corresponding genes of S. anginosus NCTC 10713T (99.2% and 97.6%, respectively), S. constellatus NCTC11325T (87.8% and 91.4%, respectively), and S. intermedia SK54T (85.8% and 91.2%, respectively) rather than those of S. sinensis HKU4T (80.5% and 82.6%). The complete genome of strain ChDC F135T consisted of 1,901,251 bp and the G+C content was 38.9 mol %. Average nucleotide identity value between strain ChDC F135T and S. sinensis HKU4T or S. anginosus NCTC 10713T were 75.7% and 95.6%, respectively. The C14:0 composition of the cellular fatty acids of strain ChDC F135T (32.8%) was different from that of S. intermedia (6-8%), S. constellatus (6-13%), and S. anginosus (13-20%). Based on the results of phylogenetic and phenotypic analysis, strain ChDC F135T (=?KCOM 2412T?=?JCM 33300T) was classified as a type strain of a novel species of the genus Streptococcus, for which we proposed the name Streptococcus periodonticum sp. nov.

Journal: Current microbiology
DOI: 10.1007/s00284-019-01695-8
Year: 2019

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