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Published on: May 13, 2020
Preliminary characterization of a novel β-agarase from Thalassospira profundimonas
Cheng Zeng1, Longtao Zhang2, Song Miao3
1College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian People's Republic of China.
Background:
The objective of this study was to characterize the agarase from a newly isolated agarolytic bacterium Thalassospira profundimaris fst-13007.
Results:
Agarase-fst was purified to homogeneity which apparent molecular weight was 66.2 kDa. Its activity was optimal at 45 °C and pH 8 and was stable at pH 5-9 or 30-50 °C. Agarase-fst required Mn(2+) for agarase activity and inhibition by Cu(2+), Fe(3+) and EDTA. Tests of hydrolysis pattern and substrate specificity, TLC analysis and mass spectrometry of the hydrolysis products revealed that it is an endo-type β-agarase hydrolyzing agarose into neoagarobiose, neoagarotetraose and neoagarohexaose. Results of MALDI-TOF-TOF/MS indicate that it lack of homology to previously identified proteins and present conserved domain of β-agarase.
Conclusion:
Agarase-fst from T. profundimaris fst-13007 was confirmed to be a novel endo-type β-agarase.
