Expression and Purification of Cellulase Xf818 from Xylella fastidiosa in Escherichia coli

Expression and Purification of Cellulase Xf818 from Xylella fastidiosa in Escherichia coli Xylella fastidiosa was the first plant pathogen whose complete genome sequence was available. X. fastidiosa causes citrus variegated chlorosis, but the physiological basis of the disease in unknown. Through comparative sequence analysis, several putative plant cell wall–degrading enzymes were identified on the X. fastidiosa genome. We have cloned Xf818, a putative endoglucanase ORF, into expression vectors pET20b and pET28b, and purified a recombinant form of Xf818 containing a His6 tag. Through biochemical assays, we have characterized the endoglucanase activity of this protein. The best conditions for hydrolysis over carboxymethyl cellulose (CMC) were on pH 5.2 at 65°C. Xf818 hydrolyzed CMC, acid swollen cellulose, Avicel, birch wood, oat spels xylans, and the oligosaccharides cellotetraose and cellopentaose. Xf818 carried out transglycosylation and had a functional cellulose-binding domain. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Current Microbiology Springer Journals

Expression and Purification of Cellulase Xf818 from Xylella fastidiosa in Escherichia coli

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Publisher
Springer Journals
Copyright
Copyright © 2006 by Springer Science+Business Media, Inc.
Subject
Life Sciences; Biotechnology; Microbiology
ISSN
0343-8651
eISSN
1432-0991
DOI
10.1007/s00284-005-0475-2
Publisher site
See Article on Publisher Site

Abstract

Xylella fastidiosa was the first plant pathogen whose complete genome sequence was available. X. fastidiosa causes citrus variegated chlorosis, but the physiological basis of the disease in unknown. Through comparative sequence analysis, several putative plant cell wall–degrading enzymes were identified on the X. fastidiosa genome. We have cloned Xf818, a putative endoglucanase ORF, into expression vectors pET20b and pET28b, and purified a recombinant form of Xf818 containing a His6 tag. Through biochemical assays, we have characterized the endoglucanase activity of this protein. The best conditions for hydrolysis over carboxymethyl cellulose (CMC) were on pH 5.2 at 65°C. Xf818 hydrolyzed CMC, acid swollen cellulose, Avicel, birch wood, oat spels xylans, and the oligosaccharides cellotetraose and cellopentaose. Xf818 carried out transglycosylation and had a functional cellulose-binding domain.

Journal

Current MicrobiologySpringer Journals

Published: Jul 27, 2006

References

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