A Gram-stain-positive, aerobic, non-motile, non-spore-forming,
and rod-shaped bacterium, designated strain CHu64-
6-1T, was isolated from a 67-cm-long sediment core collected
from the Daechung Reservoir at a water depth of 17-m in
Daejeon, Republic of Korea. Comparative 16S rRNA gene
sequence studies placed the new isolate in the class Sphingobacteriia,
and the isolate is notably most closely related to
Flavihumibacter sediminis CJ663T (98.1% similarity), Flavihumibacter
solisilvae 3-3T (97.8%), Flavihumibacter petaseus
T41T (97.5%), Flavihumibacter cheonanensis WS16T (97.4%),
and Flavihumibacter stibioxidans YS-17T (97.2%). The cells of
strain CHu64-6-1T formed yellow colonies on R2A agar and
contained MK-7 as the only menaquinone, phosphatidylethanolamine,
an unidentified phospholipid, and two unidentified
aminolipids as the major polar lipids, and C15:0
iso, C17:0 iso 3-OH, C15:1 iso G, and C16:1 ω5c as the major
fatty acids (> 5%). The DNA G + C content of the genome
was determined to be 46.5 mol%. The DNA-DNA hybridization
values of strain CHu64-6-1T with F. sediminis CJ663T,
F. solisilvae 3-3T, F. petaseus T41T, F. cheonanensis WS16T,
and F. stibioxidans YS-17T were 12.4–33.2%. Based on the
combined genotypic and phenotypic data, we propose that
strain CHu64-6-1T represents a novel species of the genus
Flavihumibacter, for which the name Flavihumibacter profundi
sp. nov. is proposed. The type strain is CHu64-6-1T
(= KCTC 62290T = CCTCC AB 2018060T).
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