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  • Title: Commensalibacter nepenthis sp. nov. and Commensalibacter oyaizuii sp. nov., from fluid in a Nepenthes pitcher cup and a butterfly (Junonia lemonias) in Thailand.
    Author: Yukphan P, Charoenyingcharoen P, Muangham S, Mhuantong W, Yamada Y.
    Journal: Int J Syst Evol Microbiol; 2024 May; 74(5):. PubMed ID: 38752996.
    Abstract:
    Two novel Gram-negative, aerobic, rod-shaped, non-motile bacteria, strains TBRC 10068T and TBRC 16381T, were isolated from a fluid sample from a close-pitcher cup (Nepenthes gracilis) and an insect sample (Junonia lemonias), respectively. Comparing the 16S rRNA gene sequences with those found in EzBioCloud's publicly available databases revealed that the two strains exhibited a close genetic relationship with Commensalibacter intestini A911T; the calculated sequence similarities were 98.56 and 97.70  %, respectively. The average nucleotide identity and digital DNA-DNA hybridization values of the two Commensalibacter strains, as well as those of their closely related type strains, were found to be lower than the species demarcation threshold of 95 and 70 %, respectively. The phylogenomic analysis of strains TBRC 10068T and TBRC 16381T showed that they belong to the genus Commensalibacter. However, they formed distinct lineages separate from all other strains of Commensalibacter by use of 81 bacterial core genes. In addition, the comparative genomic analysis revealed that the core orthologues of strains TBRC 10068T and TBRC 16381T, compared to the closely related type strains of Commensalibacter species, had distinct genetic profiles. Strain TBRC 10068T contained 163 unique genes, whereas strain TBRC 16381T contained 83. The three Commensalibacter species possessed Q-9 as the primary isoprenoid quinone homologue. The results of a polyphasic taxonomic investigation indicated that strains TBRC 10068T and TBRC 16381T represent two separate new species within the genus Commensalibacter. The species were designated as Commensalibacter nepenthis sp. nov. with the type strain TBRC 10068T (=KCTC 92798T) and Commensalibacter oyaizuii sp. nov. with the type strain TBRC 16381T (=KCTC 92799T).
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