Journal Article
- Overexpression and characterization of a novel cold-adapted and salt-tolerant GH1 β-glucosidase from the marine bacterium Alteromonas sp. L82
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Jingjing Sun , Wei Wang , Congyu Yao , Fangqun Dai , Xiangjie Zhu , Junzhong Liu , Jianhua Hao
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J. Microbiol. 2018;56(9):656-664. Published online August 23, 2018
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DOI: https://doi.org/10.1007/s12275-018-8018-2
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Abstract
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A novel gene (bgl) encoding a cold-adapted β-glucosidase
was cloned from the marine bacterium Alteromonas sp.
L82. Based on sequence analysis and its putative catalytic
conserved region, Bgl belonged to the glycoside hydrolase
family 1. Bgl was overexpressed in E. coli and purified by
Ni2+ affinity chromatography. The purified recombinant β-
glucosidase showed maximum activity at temperatures between
25°C to 45°C and over the pH range 6 to 8. The enzyme
lost activity quickly after incubation at 40°C. Therefore,
recombinant β-glucosidase appears to be a cold-adapted
enzyme. The addition of reducing agent doubled its activity
and 2 M NaCl did not influence its activity. Recombinant
β-glucosidase was also tolerant of 700 mM glucose and some
organic solvents. Bgl had a Km of 0.55 mM, a Vmax of 83.6
U/mg, a kcat of 74.3 s-1 and kcat/Km of 135.1 at 40°C, pH 7 with
4-nitrophenyl-β-D-glucopyranoside as a substrate. These
properties indicate Bgl may be an interesting candidate for
biotechnological and industrial applications.
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Citations
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- Identification of Proteolytic Bacteria from the Arctic Chukchi Sea Expedition Cruise and Characterization of Cold-active Proteases
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Ha Ju Park , Yung Mi Lee , Sunghui Kim , Ah Ram Wi , Se Jong Han , Han-Woo Kim , Il-Chan Kim , Joung Han Yim , Dockyu Kim
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J. Microbiol. 2014;52(10):825-833. Published online August 27, 2014
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DOI: https://doi.org/10.1007/s12275-014-4226-6
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Abstract
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Following collection of seawater samples during an Arctic
Chukchi Sea expedition cruise of the Korean icebreaker
Araon in 2012, a total of 15,696 bacteria were randomly isolated
from Marine Broth 2216 agar plates. Of these, 2,526
(16%) showed proteolytic activity and were identified as
mainly Alteromonas (31%), Staphylococcus (27%), and Pseudoalteromonas
(14%). Among the proteolytic strains, seven
were selected based on their significant ability to grow and
produce a halo on skim milk plates at low temperatures
(<5°C) owing to cold-active proteases. These strains were
affiliated with the genus Pseudoalteromonas and were divided
into three groups based on phylogenetic analysis of the 16S
rRNA genes. Profiling cell membrane fatty acids confirmed
the 16S rRNA-based differentiation and revealed the accordance
between the two analyses. Seven genes for serine protease
precursors were amplified from the corresponding
strains, and based on sequence similarities, these genes were
divided into three groups that were identical to those identified
by the 16S rRNA phylogenetic analysis. Three protease
genes from the representative strains of each group
were composed of 2,127–2,130 bp, encoding 708–709 amino
acids, and these genes yielded products with calculated molecular
weights of approximately 72.3–72.8 kDa. Amino acid
sequence analysis suggested that the precursors are members
of the subtilase serine endo- and exo-peptidase clan and contain
four domains (signal peptide, N-terminal prosequence,
catalytic domain, and two pre-peptidase C-terminal domains).
Upon expression in E. coli, each recombinant protease exhibited
proteolytic activity on zymogram gels.
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Citations
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Marine Life Science & Technology.2020; 2(4): 309. CrossRef - Characterization of balofloxacin-stressed proteomics and identification of balofloxacin-binding proteins pre-peptidase and integration host factor in Edwardsiella tarda
Qi Wen, Xian-jie Liu, Wei-cong Zhu, Lu Li, Min-yi Li, Xuna-xian Peng, Hui Li
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Jean-Étienne R.L. Morlighem, Gandhi Radis-Baptista
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Journal Article
- Monitoring of Algicidal Bacterium, Alteromonas sp. Strain A14 in its Application to Natural Cochlodinium polykrikoides Blooming Seawater Using Fluorescence In Situ Hybridization
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Bo-Kyung Lee , Toshiya Katano , Shin-Ichi Kitamura , Myung-Joo Oh , Myung-Soo Han
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J. Microbiol. 2008;46(3):274-282. Published online July 5, 2008
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DOI: https://doi.org/10.1007/s12275-007-0238-9
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35
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Abstract
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The red tide of dinoflagellate, Cochlodinium polykrikoides has frequently occurred in coastal waters, causing severe damage to fisheries. In the present study, the algicidal bacterium Alteromonas sp. A14 isolated from the southern coast of Korea was applied to a red tide of C. polykrikoides in a laboratory experiment. In the experiment, the abundance of the strain A14 was monitored using fluorescence in situ hybridization. Inoculation of the A14 at a final cell density of 9.0×105 cells/ml caused a significant decrease in C. polykrikoides abundance from 1,830 to 700 cells/ml during 2 days, while abundances of harmless diatoms rapidly increased from 3 days. Abundances of both A14 and other bacteria increased to 1 day. After 1 day, with flagellate abundance increased, bacterial abundance decreased. Finally, algicidal bacterial abundance decreased to 3.5×104 cells/ml. In the biological control of harmful algal blooms, in addition to decrease in target algal abundance and not occurrence of other harmful blooms, decrease in abundance of utilized organism is also important. This study emphasizes the importance of monitoring the inoculated bacterium when applying bacterium to natural seawater.
Research Support, Non-U.S. Gov't
- Cryoprotective Properties of Exopolysaccharide (P-21653) Produced by the Antarctic Bacterium, Pseudoalteromonas arctica KOPRI 21653
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Sung Jin Kim , Joung Han Yim
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J. Microbiol. 2007;45(6):510-514.
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DOI: https://doi.org/2643 [pii]
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Abstract
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Twenty-five bacterial strains that secrete mucous materials were isolated from sediment obtained from King George Island, Antarctica. Seven of these strains proved capable of producing cryoprotective exopolysaccharides. The strain KOPRI 21653 was selected for the further study of an anti-ice-nucleating polysaccharide (ANP), which originated from a polar region. KOPRI 21653 was identified as Pseudoalteromonas arctica as the result of 16S rRNA analysis. The exopolysaccharide, P-21653, was purified completely from the KOPRI 21653 cell culture via column chromatography and protease treatment. The principal sugar components of P-21653 were determined to be galactose and glucose, at a ratio of 1:1.5, via GC-MS analysis. The cryoprotective activity of P-21653 was characterized via an E. coli viability test. In the presence of 0.1% (w/v) P-21653, the survival ratio of E. coli cells was as high as 82.6% over three repeated freeze-thaw cycles. The survival ratio decreased drastically to 71.5 and 48.1%, respectively, in five and seven repeated cycle conditions; however, the survival ratios were greater over three (96.6-92.1%) to seven (100.5-91.6%) freeze-thaw cycles in the presence of 0.5 and 1.0% (w/v) P-21653. In addition, at much lower concentrations (0.1-1.0%), P-21653 resulted in survival ratios (83.1-98.4%) similar to those of two commercially available cryoprotectants (VEG plus X-1000, 92.9% and VM3, 95.3%), which were utilized at the recommended concentrations (90%). The biochemical characteristics of exopolysaccharide P-21653 reflect that this compound may be developed as a useful cryoprotectant for use in medical applications and in the food industry.