Biotechnology Bulletin ›› 2019, Vol. 35 ›› Issue (11): 179-186.doi: 10.13560/J.cnki.biotech.bull.1985.2019-0449

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Research Progress on Chitin Deacetylase

ZHANG Yan1, 2, GUAN Fei-fei2, WU Ning-feng2, TIAN Jian2   

  1. 1. College of Food Science and Technology,Hebei Agricultural University,Baoding 071000;
    2. Biotechnology Research Institute,Chinese Academy of Agricultural Sciences,Beijing 100081
  • Received:2019-05-22 Online:2019-11-26 Published:2019-11-19

Abstract: Chitin is the second largest polysaccharide to cellulose in the natural world. Chitosan is a de-acetylated derivative from chitin and has been widely used due to its fine solubility. First,a various deacetylase protein sequences from different sources were collected and aligned,then bioinformatics methods were conducted to carry out in-depth excavation and analysis of their catalytically active central domains,and the similarities and differences of biological sources,catalytic mechanisms and reaction conditions of various deacetylases with different catalytic domains were elucidated. The results showed that the studied deacetylases were mostly derived from fungi and insects,mostly belonged to the CE4 family,and had the catalytic activity center of NodB. It was easier for them to react with acetylated oligosaccharides with a polymerization degree >3,while difficult to catalyze poorly soluble polysaccharides. Most of these enzymes had the maximum enzyme activity at pH 8.0 and 40-70℃,and different divalent metal ions had different impacts on different enzymes. Finally,this paper proposed a new direction for rapid and specific screening of new enzymes,analysis of enzymatic hydrolysis mechanisms and molecular engineering from marine macrogenomic libraries,providing a new insight for researchers in the field to develop highly efficient and highly specific deacetylases.

Key words: chitin, deacetylase, catalytic domain, bioinformatics, new enzyme screening