Abstract
We have previously reported a non-processive endo-type chitinase, ChiA, from a newly isolated marine psychrophilic bacterium, Pseudoalteromonas sp. DL-6. In this study, a processive exo-type chitinase, ChiC, was cloned from the same bacterium and characterized in detail. ChiC could hydrolyze crystalline chitin into (GlcNAc)2 as the only observed product. It exhibited high catalytic activity even at low temperatures, e.g. close to 0 °C, or in the presence of 5 M NaCl, suggesting that ChiC was a cold-adapted and highly salt-tolerant chitinase. ChiC could also hydrolyze other substrates, including chitosan and Avicel, indicating its broad substrate specificity. Sequence features indicated that ChiC was a multi-domain protein having a deep substrate-binding groove that was regarded as characteristic of processive exo-chitinases. Enzymatic hydrolysis of chitin by ChiC could be remarkably boosted in the presence of ChiA, suggesting the synergy of ChiC and ChiA. This work provided a new evidence to prove that marine psychrophilic bacteria utilized a synergistic enzyme system to degrade recalcitrant chitin.
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Acknowledgments
The study was financially supported by the program for National High-tech Research and Development Program 863 (2014AA093604), National Science Foundation (No. 31500039; No. 31300668), National High-tech Research and Development Program 863 (2012AA021501), and the Key Deployment Program of Chinese Academy of Sciences (KSZD-EW-Z-015-2). Dr. Heng Yin was supported by Youth Innovation Promotion Association of Chinese Academy of Sciences (2015144).
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Wang, X., Chi, N., Bai, F. et al. Characterization of a cold-adapted and salt-tolerant exo-chitinase (ChiC) from Pseudoalteromonas sp. DL-6. Extremophiles 20, 167–176 (2016). https://doi.org/10.1007/s00792-016-0810-5
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DOI: https://doi.org/10.1007/s00792-016-0810-5