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- Isolation, cultivation, and genome analysis of proteorhodopsincontaining SAR116-clade strain Candidatus Puniceispirillum marinum IMCC1322
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Junhak Lee , Kae Kyoung Kwon , Seung-Il Lim , Jaeho Song , Ah Reum Choi , Sung-Hyun Yang , Kwang-Hwan Jung , Jung-Hyun Lee , Sung Gyun Kang , Hyun-Myung Oh , Jang-Cheon Cho
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J. Microbiol. 2019;57(8):676-687. Published online June 14, 2019
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DOI: https://doi.org/10.1007/s12275-019-9001-2
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Abstract
- Strain IMCC1322 was isolated from a surface water sample
from the East Sea of Korea. Based on 16S rRNA analysis,
IMCC1322 was found to belong to the OCS28 sub-clade of
SAR116. The cells appeared as short vibrioids in logarithmicphase
culture, and elongated spirals during incubation with
mitomycin or in aged culture. Growth characteristics of strain
IMCC1322 were further evaluated based on genomic information;
proteorhodopsin (PR), carbon monoxide dehydrogenase,
and dimethylsulfoniopropionate (DMSP)-utilizing
enzymes. IMCC1322 PR was characterized as a functional
retinylidene protein that acts as a light-driven proton pump
in the cytoplasmic membrane. However, the PR-dependent
phototrophic potential of strain IMCC1322 was only observed
under CO-inhibited and nutrient-limited culture conditions.
A DMSP-enhanced growth response was observed in addition
to cultures grown on C1 compounds like methanol, formate,
and methane sulfonate. Strain IMCC1322 cultivation
analysis revealed biogeochemical processes characteristic of
the SAR116 group, a dominant member of the microbial community
in euphotic regions of the ocean. The polyphasic taxonomy
of strain IMCC1322 is given as Candidatus Puniceispirillum
marinum, and was confirmed by chemotaxonomic
tests, in addition to 16S rRNA phylogeny and cultivation
analyses.
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