Characterization of a novel psychrophilic and halophilic β-1, 3-xylanase from deep-sea bacterium, Flammeovirga pacifica strain WPAGA1

International Journal of Biological Macromolecules
Zheng-Wen CaiGuang-Ya Zhang

Abstract

β-1, 3-Xylanase is one of the most important hydrolytic enzymes to prepare oligosaccharides as functional foods in seaweed industry. However, less than five β-1, 3-xylanases have been experimentally expressed and characterized; moreover, none of them is psychrophilic and salt tolerant. Here, we mined a novel β-1, 3-xylanase (Xyl512) from the genome of the deep-sea bacterium Flammeovirga pacifica strain WPAGA1 and biochemically characterized it in detail. The Xyl512 did not contain any carbohydrate-binding module; the catalytic domain of it belonged to the glycoside hydrolase family 26. The optimum temperature and pH of the purified β-1, 3-xylanase was 20 °C and pH 7.0 in the condition of no NaCl. However, they shifted to 30 °C and 7.5 with 1.5 mol/L NaCl, respectively. In this condition (1.5 mol/L NaCl), the overall activity was 2-fold as high as that without NaCl. Based on the residue interactions and the electrostatic surfaces, we addressed the possible mechanism of its adaption to low temperature and relative high NaCl concentration. The Xyl512 showed significantly reduced numbers of hydrogen bonds leading to a more flexible structure, which is likely to be responsible for its cold adaptation. While the negatively charged su...Continue Reading

Citations

May 12, 2019·International Journal of Molecular Sciences·Seng Chong TeoKian Mau Goh
Sep 12, 2019·Frontiers in Microbiology·Mohammad Ali AmoozegarAntonio Ventosa
Jul 30, 2021·Journal of Agricultural and Food Chemistry·Lijuan CaoZunxi Huang
Aug 31, 2021·Applied Microbiology and Biotechnology·Johan S HeroM Alejandra Martinez

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