Expression and Characterization of a Novel Thermostable and pH-Stable β-Agarase from Deep-Sea Bacterium Flammeovirga Sp. OC4.
A novel gene (aga4436), encoding a potential agarase of 456 amino acids, was identified in the genome of deep-sea bacterium Flammeovirga sp. OC4. Aga4436 belongs to the glycoside hydrolase 16 β-agarase family. Aga4436 was expressed in Escherichia coli as a fusion protein and purified. Recombinant Aga4436 showed an optimum agarase activity at 50-55 °C and pH 6.5, with a wide active range of temperatures (30-80 °C) and pHs (5.0-10.0). Notably, Aga4436 retained more than 90%, 80%, and 35% of its maximum activity after incubation at 30 °C, 40 °C, and 50 °C for 144 h, respectively, which exhibited an excellent thermostability in medium-high temperatures. Besides, Aga4436 displayed a remarkable tolerance to acid and alkaline environments, as it retained more than 70% of its maximum activity at a wide range of pHs from 3.0 to 10.0 after incubation in tested pHs for 60 min. These desirable properties of Aga4436 could make Aga4436 attractive in the food and nutraceutical industries.
College of Food Science, Fujian Agriculture and Forestry University , Fuzhou, Fujian 350002, China.|State Key Laboratory Breeding Base of Marine Genetic Resource, Third Institute of Oceanography, State Oceanic Administration , Xiamen, Fujian 361005, China.
Xing-Lin
XL
Chen
State Key Laboratory Breeding Base of Marine Genetic Resource, Third Institute of Oceanography, State Oceanic Administration , Xiamen, Fujian 361005, China.
Yan-Ping
YP
Hou
State Key Laboratory Breeding Base of Marine Genetic Resource, Third Institute of Oceanography, State Oceanic Administration , Xiamen, Fujian 361005, China.|South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center , Guangzhou, Guangdong 510000, China.
Min
M
Jin
State Key Laboratory Breeding Base of Marine Genetic Resource, Third Institute of Oceanography, State Oceanic Administration , Xiamen, Fujian 361005, China.|South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center , Guangzhou, Guangdong 510000, China.
Run-Ying
RY
Zeng
College of Food Science, Fujian Agriculture and Forestry University , Fuzhou, Fujian 350002, China.
He-Tong
HT
Lin
D000595:Amino Acid Sequence; D041963:Bacteroidetes / Q000201:enzymology* / Q000235:genetics; D001483:Base Sequence; D004795:Enzyme Stability; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D006026:Glycoside Hydrolases / Q000235:genetics / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008970:Molecular Weight; D012623:Seawater / Q000382:microbiology*; D016415:Sequence Alignment; D013379:Substrate Specificity; D013696:Temperature; D014871:Water Microbiology
D006026:Glycoside Hydrolases; C019624:agarase
Flammeovirga sp. OC4; deep-sea bacterium; pH stable; thermostable; β-agarase