- Grimontia marina sp. nov., a Marine Bacterium Isolated from the Yellow Sea
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Ahyoung Choi , Kyung-Mi Kim , Ilnam Kang , Seok-Hyun Youn , Young-Sang Suh , Yoon Lee , Jang-Cheon Cho
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J. Microbiol. 2012;50(1):170-174. Published online February 27, 2012
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DOI: https://doi.org/10.1007/s12275-012-1615-6
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A novel species belonging to the genus Grimontia is described
in this study. A Gram-negative, chemoheterotrophic, obligately
aerobic, catalase- and oxidase-positive, motile by a
single polar flagellum, and rod-shaped bacterium, designated
IMCC5001T, was isolated from surface seawater of
the Yellow Sea. Strain IMCC5001T grew optimally at 30°C
in the presence of 3.5% NaCl. Phylogenetic analysis based
on 16S rRNA gene sequences showed that the isolate was
related most closely to Grimontia hollisae with a sequence
similarity of 95.8%, and formed a robust phyletic lineage
with Grimontia hollisae. Differential physiological characteristics
between the new strain and Grimontia hollisae
KCCM 41680T and chemotaxonomic characterization including
determination of DNA G+C content, fatty acid methyl
esters, quinone composition, and polar lipid profiles justified
the assignment of strain IMCC5001T to the genus Grimontia
as a novel species. In conclusion, strain IMCC5001T represents
a new species, for which the name Grimontia marina sp.
nov. is proposed, with the type strain IMCC5001T (=KCTC
22666T =NBRC 105794T).
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Citations
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Enterovibrio paralichthyis sp. nov., isolated from the gut of an olive flounder Paralichthys olivaceus
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- Helicobacter pylori γ-Glutamyltranspeptidase Induces Cell Cycle Arrest at the G1-S Phase Transition
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Kyung-Mi Kim , Seung-Gyu Lee , Jung-Min Kim , Do-Su Kim , Jea-Young Song , Hyung-Lyun Kang , Woo-Kon Lee , Myung-Je Cho , Kwang-Ho Rhee , Hee-Shang Youn , Seung-Chul Baik
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J. Microbiol. 2010;48(3):372-377. Published online June 23, 2010
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DOI: https://doi.org/10.1007/s12275-010-9293-8
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909
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In our previous study, we showed that Helicobacter pylori γ-glutamyltranspeptidase (GGT) is associated with H. pylori-induced apoptosis through a mitochondrial pathway. To better understand the role of GGT in apoptosis, we examined the effect of GGT on cell cycle regulation in AGS cells. To determine the effect of recombinant GGT (rGGT) on cell cycle distribution and apoptosis, rGGT-treated and untreated AGS cells were analyzed in parallel by flow cytometry using propidium iodide (PI). We found that rGGT inhibited the growth of AGS cells in a time-dependent manner, and that the pre-exposure of cells to a caspase-3 inhibitor (z-DEVD-fmk) effectively blocked GGT-induced apoptosis. Cell cycle analysis showed G1 phase arrest and apoptosis in AGS cells following rGGT treatment. The rGGT-mediated G1 phase arrest was found to be associated with down-regulation of cyclin E, cyclin A, Cdk 4, and Cdk 6, and the up-regulation of the cyclindependent kinase (Cdk) inhibitors p27 and p21. Our results suggest that H. pylori GGT induces cell cycle arrest at the G1-S phase transition.
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