Expression of a thermostable xylanase gene from Bacillus coagulans ST-6 in Lactococcus lactis

Abdul Rahim, Raha and Chang, L. Y. and Sipat, Abdullah and Yusoff, Khatijah and Toosa, Haryanti (2006) Expression of a thermostable xylanase gene from Bacillus coagulans ST-6 in Lactococcus lactis. Letters in Applied Microbiology, 42 (3). pp. 210-214. ISSN 0266-8254

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Aims: The aim of the study is to evaluate whether xylanase can be used as a potential reporter gene for cloning and expression studies in Lactococcus. Methods and Results: The 750 bp xylanase gene was amplified and subcloned into the unique NheI restriction enzyme site of pMG36e and subsequently transformed into competent Escherichia coli XLI-blue MRF cells and Lactococcus lactis cells. Bacterial culture containing pMG36e-Xy has an enzyme activity of 390 μg xylose ml−1 culture 30 min−1, respectively, when compared with 40 μg xylose ml−1 culture 30 min−1 for the negative control (plasmidless strain). Conclusions: The thermostable xylanase gene was successfully expressed in both E. coli and L. lactis. The activity of xylanase can be easily detected by the formation of visible clearing zones around the transformed colonies on Remazol Brilliant Blue-Xylan (RBB-Xylan) agar media. However, there were some significant differences in the optimum growth temperature and plasmid stability in the new clones. Significance and Impact of the Study: The constructed reporter vector has the potential to be used as a reporter system for Lactococcus as well as E. coli, and it is an addition to the pool of lactococcal vector systems.

Item Type:Article
Keyword:cloning, expression, Lactococcus, xylanase
Faculty or Institute:Faculty of Biotechnology and Biomolecular Sciences
Publisher:The Society for Applied Microbiology
DOI Number:10.1111/j.1472-765X.2006.01856.x
ID Code:5628
Deposited By: Erni Suraya Abdul Aziz
Deposited On:21 Apr 2010 04:02
Last Modified:20 Jul 2010 09:12

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