期刊
FOOD CHEMISTRY
卷 253, 期 -, 页码 139-147出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.01.137
关键词
Chitosanase; Chitooligosaccharide; Gynuella sunshinyii; Chitin conversion; Cold-adapted; Glycoside hydrolase family 46
资金
- National Natural Science Foundation of China [31701537]
- China Postdoctoral Science Foundation [2016M601530]
- Shanghai Sailing Program [17YF1403500]
- Fundamental Research Funds for the Central Universities [222201717026, 222201814031]
- Shu Guang project of Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [15SG28]
Chitooligosaccharide is widely used as a functional food additive and a valuable pharmacological agent. The transformation of chitinous biomass into valuable bioactive chitooligosaccharides is one of the most exciting applications of chitosanase. A novel glycoside hydrolase (GH) family 46 chitosanase (GsCsn46A) from rhizobacterium Gynuella sunshinyii was cloned and heterologously expressed in Escherichia coli. GsCsn46A showed maximal activity at pH 5.5 and 30 degrees C. GsCsn46A featured remarkable cold-adapted property, which controllably hydrolyzed chitosan to three types of chitooligosaccharides at the mild reaction condition (reaction condition: pH 5.5 at 30 degrees C; method for stopping the reaction: 50 degrees C for 30 min). The yields of three types of chitooligosaccharides products (degree of polymerization (DP): 2-7, 2-5 and 2-3) were 70.9%, 87.1% and 94.6% respectively. This novel cold-adapted chitosanase provides a cleaner production process for the controllable preparation of chitooligosaccharides with the specific DP.
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