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Overexpression and characterization of a novel chitinase gene from a marine bacterium Pseudomonas sp. BK1.
Indian J Biochem Biophys ; 2005 Dec; 42(6): 339-44
Article in English | IMSEAR | ID: sea-26940
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 40 degrees C. 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.
Subject(s)
Full text: Available Index: IMSEAR (South-East Asia) Main subject: Oligosaccharides / Pseudomonas / Substrate Specificity / Chitin / Chitinases / Cloning, Molecular Language: English Journal: Indian J Biochem Biophys Year: 2005 Type: Article

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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Oligosaccharides / Pseudomonas / Substrate Specificity / Chitin / Chitinases / Cloning, Molecular Language: English Journal: Indian J Biochem Biophys Year: 2005 Type: Article