Overexpression and Biochemical Properties of a GH46 Chitosanase From Marine R1 Suitable for Chitosan Oligosaccharides Preparation

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2022 Feb 17

PMID 35173697

Authors

Jianrong Wang

Ping Wang

Mujin Zhu

Wei Chen

Si Yu

Bin Zhong

Affiliations

Soon will be listed here.

Abstract

Due to the various biological activities of chitosan oligosaccharides (COSs), they have great potential value for use in many areas. Chitosanase plays an important role in enzymatic preparation of COSs. Herein, a gene encoding a chitosanase (Csn46) from marine R1 was cloned and the sequences encoding Csn46 without signal peptide were optimized based on the codon usage of (). In addition, the optimized gene was ligated to pPICZαA and transformed to X33. After screening, a recombinant strain named X33-Sh33 with the highest activity was isolated from 96 recombinant colonies. The maximum activity and total protein concentration of the recombinant strain Csn46 were 2250 U/ml and 3.98 g/l, respectively. The optimal pH and temperature of purified Csn46 were 5.5 and 55°C, respectively. Meanwhile, Csn46 was stable from pH 5.0 to 10.0 and 40 to 55°C, respectively. The purified Csn46 was activated by Mn and inhibited by Cu, Fe, and Al. In addition, substrate specificity of the purified Csn46 showed highest activity toward colloidal chitosan with 95% degree of deacetylation. Furthermore, the purified Csn46 exhibited high efficiency to hydrolyze 4% colloidal chitosan to prepare COSs. COSs with degree of polymerization of 2-6, 2-5, and 2-4 were controllably produced by adjusting the reaction time. This study provides an excellent chitosanase for the controllable preparation of COSs with a desirable degree of polymerization.

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