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A novel thermophilic exochitinase ChiEn3 from Coprinopsis cinerea exhibits a hyperhydrolytic activity toward 85% deacetylated chitosan and a significant application to preparation of chitooligosaccharides from the chitosan
- Zhou, Jiangsheng, Dai, Rujuan, Wang, Yanxin, Li, Maomao, Zhu, Yiting, Chen, Lingling, Kang, Liqin, Liu, Zhonghua, Yang, Yao, Yuan, Sheng
- Carbohydrate polymers 2019 v.207 pp. 729-736
- Coprinopsis cinerea, chitin, chitinase, chitooligosaccharides, chitosan
- ChiEn3 from Coprinopsis cinerea was characterized as an exo-acting chitinase with a processivity. ChiEn3 hydrolyzed only soluble chitin and exhibited a hyperhydrolytic activity toward 85% deacetylated chitosan which was 33.6-fold higher than its hydrolytic activity toward glycol chitin. Its maximum hydrolytic activity was observed at 60 °C and retained 66.2% of hydrolytic activity after 60 min incubation at 60 °C. Commercial 85% deacetylated chitosan was degraded by ChiEn3 to a series of COSs with a DP of 2–20 in which COSs with a DP of 3–6 were dominant, whereas, lab-prepared chitosan (FA = 0.65) was degraded by ChiEn3 to COSs with a DP of 2–10 in which the AA dimer was dominant. DPPH-radical-scavenging activity of ChiEn3-digested products of 85% deacetylated chitosan was 3.32-fold higher than that of undigested 85% deacetylated chitosan. Therefore, ChiEn3 shows a valuable advantage for application to the preparation of COSs from commercial 85% deacetylated chitosan.