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. 1990 Apr;56(4):844–848. doi: 10.1128/aem.56.4.844-848.1990

Purification and Characterization of Three Chitosanase Activities from Bacillus megaterium P1

A Pelletier 1, J Sygusch 1,*
PMCID: PMC184310  PMID: 16348170

Abstract

Bacillus megaterium P1, a bacterial strain capable of hydrolyzing chitosan, was isolated from soil samples. Chitosan-degrading activity was induced by chitosan but not by its constituent d-glucosamine. Extracellular secretion of chitosanase reached levels corresponding to 1 U/ml under optimal conditions. Three chitosan-degrading proteins (chitosanases A, B, and C) were purified to homogeneity. Chitosanase A (43 kilodaltons) was highly specific for chitosan and represented the major chitosan-hydrolyzing species. Chitosanases B (39.5 kilodaltons) and C (22 kilodaltons) corresponded to minor activities and possessed comparable specific activities toward chitosan, chitin, and cellulose. Chitosanase A was active from pH 4.5 to 6.5 and was stable on the basis of activity up to 45°C. The optimum temperature for enzymatic chitosan hydrolysis was 50°C. Kinetic studies on chitosanase A suggest that the enzyme is substrate inhibited. The apparent Km and Vmax determined at 22°C and pH 5.6 were 0.8 mg/ml and 280 U/mg, respectively. End products of chitosan hydrolysis by each of the three chitosanases were identified as glucosamine oligomers, similar to those obtained for previously reported chitosanase digestions.

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Selected References

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