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Applied and Environmental Microbiology, May 2007, p. 2825-2831, Vol. 73, No. 9
0099-2240/07/$08.00+0     doi:10.1128/AEM.02872-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Cloning, Characterization, and Molecular Application of a Beta-Agarase Gene from Vibrio sp. Strain V134{triangledown}

Wei-wei Zhang1,2 and Li Sun1*

Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, People's Republic of China,1 Graduate University of the Chinese Academy of Sciences, Beijing 100049, People's Republic of China2

Received 7 December 2006/ Accepted 18 February 2007

V134, a marine isolate of the Vibrio genus, was found to produce a new beta-agarase of the GH16 family. The relevant agarase gene agaV was cloned from V134 and conditionally expressed in Escherichia coli. Enzyme activity analysis revealed that the optimum temperature and pH for the purified recombinant agarase were around 40°C and 7.0. AgaV was demonstrated to be useful in two aspects: first, as an agarolytic enzyme, the purified recombinant AgaV could be employed in the recovery of DNA from agarose gels; second, as a secretion protein, AgaV was explored at the genetic level and used as a reporter in the construction of a secretion signal trap which proved to be a simple and efficient molecular tool for the selection of genes encoding secretion proteins from both gram-positive and gram-negative bacteria.

* Corresponding author. Mailing address: Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, People's Republic of China. Phone and fax: 86-532-82898834. E-mail: lsun{at}ms.qdio.ac.cn

{triangledown} Published ahead of print on 2 March 2007.

Applied and Environmental Microbiology, May 2007, p. 2825-2831, Vol. 73, No. 9
0099-2240/07/$08.00+0     doi:10.1128/AEM.02872-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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