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Expression of a gene encoding chitinase (pCA 8 ORF) from Aeromonas sp. no. 10S-24 in Escherichia coli and enzyme characterization.

Authors
  • Sutrisno, A
  • Ueda, M
  • Inui, H
  • Kawaguchi, T
  • Nakano, Y
  • Arai, M
  • Miyatake, K
Type
Published Article
Journal
Journal of Bioscience and Bioengineering
Publisher
Elsevier
Publication Date
Jan 01, 2001
Volume
91
Issue
6
Pages
599–602
Identifiers
PMID: 16233047
Source
Medline
License
Unknown

Abstract

A gene encoding chitinase from Aeromonas sp. no. 10S-24 was expressed using pTrc99A in Escherichia coli JM 105 which yielded a 5-fold higher activity than when pUC19 was used. Three different truncated enzymes (SA-1, SA-2 and SA-3) were obtained after purification. Their isoelectric points were 7.0, 6.9, and 6.7, respectively. The enzymes showed two optimum pHs, 4.0 and 7.0, when incubated with ethylene glycol chitin as the substrate, and were stable over a wide pH range (3.0-9.0). The optimum temperature was 60 degrees C and the enzymes were stable up to 50 degrees C. The chitinases exhibited wide substrate specificities for chitin-related compounds.

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