Title |
Bacteroides sedimenti sp. nov., isolated from a chloroethenesdechlorinating consortium enriched from river sediment |
Author |
Mohamed Ismaeil1, Naoko Yoshida2,3, and Arata Katayama1,3,4 |
Address |
1Department of Environmental Engineering and Architecture, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8603, Japan, 2Department of Civil Engineering, Nagoya Institute of Technology (Nitech), Nagoya 466-8555, Japan, 3Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8603, Japan, 4Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan |
Bibliography |
Journal of Microbiology, 56(9),619–627, 2018,
|
DOI |
10.1007/s12275-018-8187-z
|
Key Words |
Bacteroides sedimenti, chloroethenes, dechlorination,
free-living Bacteroides |
Abstract |
A Gram-negative, anaerobic, non-motile, non-spore-forming
bacterial strain, designated YN3PY1T, was isolated from a
chloroethene-dechlorinating consortium originally enriched
from river sediment. The strain enhanced the dechlorination
of cis-dichloroethene to ethene by Dehalococcoides, especially
at the early stages of cultivation. Strain YN3PY1T was
the first isolate of the genus Bacteroides, obtained from animal-
independent environments, and its 16S rRNA gene had
the highest sequence similarity (97.1%) with Bacteroides luti
JCM 19020T in the ‘Coprosuis’ clade of the genus Bacteroides.
Strain YN3PY1T formed a phylogenetic cluster with other
phylotypes detected from sediments and paddy soil, and the
cluster was affiliated with a linage of so-called free-living
Bacteroides detected from animal-independent environments,
suggesting specific adaptations to sediment-like environments.
The strain showed typical phenotypes of Bacteroides, i.e.,
polysaccharolytic anaerobe having anteiso-C15:0 as the most
abundant fatty acid and MK-11 as one of the major respiratory
quinones. Additionally, the strain uniquely transforms
glucose to lactate and malate, has MK-12 as another major
respiratory quinone, and grows at comparatively low temperatures,
i.e. 10–40°C, with an optimum at 28°C. Based on
the presented data, strain YN3PY1T (= KCTC 15656T = NBRC
113168T) can be proposed as a novel species of the genus
Bacteroides and named as Bacteroides sedimenti sp. nov. |