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Applied and Environmental Microbiology, October 2009, p. 6626-6629, Vol. 75, No. 20
0099-2240/09/$08.00+0     doi:10.1128/AEM.01387-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

An Mrp-Like Cluster in the Halotolerant Cyanobacterium Aphanothece halophytica Functions as a Na+/H+ Antiporter{triangledown}

Fuminori Fukaya,1 Worrawat Promden,1 Takashi Hibino,1 Yoshito Tanaka,1 Tatsunosuke Nakamura,2 and Teruhiro Takabe1,3*

Graduate School of Environmental and Human Sciences, Meijo University, Nagoya 468-8502, Japan,1 Niigata University of Pharmacy and Applied Life Sciences, Niigata 956-860, Japan,2 Research Institute, Meijo University, Nagoya 468-8502, Japan3

Received 14 June 2009/ Accepted 9 August 2009

The mrp homolog gene cluster mrpCD1D2EFGAB (Ap-mrp) was found in a halotolerant cyanobacterium, Aphanothece halophytica, amplified, and expressed in Escherichia coli mutant TO114. Ap-mrp complemented the salt-sensitive phenotype of TO114 and exhibited Na+/H+ and Li+/H+ exchange activities, indicating that Ap-Mrp functions as a Na+/H+ antiporter.

* Corresponding author. Mailing address: Research Institute of Meijo University, Tenpaku-ku, Nagoya 468-8502, Japan. Phone: 81-52-838-2277 Fax: 81-52-832-1545. E-mail: takabe{at}ccmfs.meijo-u.ac.jp

{triangledown} Published ahead of print on 21 August 2009.

Applied and Environmental Microbiology, October 2009, p. 6626-6629, Vol. 75, No. 20
0099-2240/09/$08.00+0     doi:10.1128/AEM.01387-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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