作者: Y LEE , I PARK , J YOO , S CHUNG , Y LEE
DOI: 10.1016/J.BIORTECH.2006.09.048
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摘要: Abstract A chitinase encoding gene from Bacillus sp. DAU101 was cloned in Escherichia coli . The nucleotide sequencing revealed a single open reading frame containing 1781 bp and 597 amino acids with 66 kDa by sodium dodecyl sulfate–polyacrylamide gel electrophoresis zymogram. composed of three domains: catalytic domain, fibronectin III chitin binding domain. purified GST-fusion purification system. pH temperature optima the enzyme were 7.5 60 °C, respectively. metal ions, Zn 2+ , Cu Hg strongly inhibited activity. However, activity increased 1.4-fold Co Chisb could hydrolyze GlcNAc 2 to N -acetylglucosamine produced when derivatives used as substrate. This indicated that bifunctional enzyme, -acetylglucosaminase chitobiosidase. not glycol chitin, chitosan, or CMC, but hydrolyzed colloidal soluble chitosan.