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IJBB Vol.42(6) [December 2005] >


Title: Overexpression and characterization of a novel chitinase gene from a marine bacterium Pseudomonas sp. BK1
Authors: Jang, Moon-Sun
Lee, Young-Mi
Cho, Young-Su
Choi, Yong-Lark
Kim, Cherol-Ho
Lee, Young-Choon
Keywords: Pseudomonas
Chitinase
Cloning
Overexpression
Refolding
Issue Date: Dec-2005
Publisher: CSIR
IPC CodeC12N15/52; C12N9/28
Abstract: The chitinase A (ChiA)-coding gene of Pseudomonas sp. BK1, which was isolated from a marine red alga Porphyra dentata, was cloned and expressed in Escherichia coli. The structural gene consists of 1602 bp encoding a protein of 534 amino acids, with a predicted molecular weight of 55,370 Da. The deduced amino acid sequence of ChiA showed low identity (less than 32%) with other bacterial chitinases. The ChiA was composed of multiple domains, unlike the arrangement of domains in other bacterial chitinases. Recombinant ChiA overproduced as inclusion bodies was solubilized in the presence of 8 M urea, purified in a urea-denatured form and re-folded by removing urea. The purified enzyme showed maximum activity at pH 5.0 and 40ºC. It exhibited high activity towards glycol chitosan and glycol chitin, and lower activity towards colloidal chitin. The enzyme hydrolyzed the oligosaccharides from (GlcNAc)₄ to (GlcNAc)₆, but not GlcNAc to (GlcNAc)3. The results suggest that the ChiA is a novel enzyme, with different domain structure and action mode from bacterial family 18 chitinases.
Page(s): 339-344
ISSN: 0301-1208
Source:IJBB Vol.42(6) [December 2005]

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