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Applied and Environmental Microbiology, October 1998, p. 4095-4097, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Synthesis of Glycine Betaine from Exogenous Choline in the Moderately Halophilic Bacterium Halomonas elongata

David Cánovas,1,2 Carmen Vargas,1 Laszlo N. Csonka,2 Antonio Ventosa,1 and Joaquín J. Nieto1,*

Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain,1 and Department of Biological Sciences, Purdue University, West Lafayette, Indiana 479072

Received 4 May 1998/Accepted 1 July 1998

The role of choline in osmoprotection in the moderate halophile Halomonas elongata has been examined. Transport and conversion of choline to betaine began immediately after addition of choline to the growth medium. Intracellular accumulation of betaine synthesized from choline was salt dependent up to 2.5 M NaCl. Oxidation of choline was enhanced at 2.0 M NaCl in the presence or absence of externally provided betaine. This indicates that the NaCl concentration in the growth medium has major effects on the choline-betaine pathway of H. elongata.

* Corresponding author. Mailing address: Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain. Phone: 34 95455 6765. Fax: 34 95462 8162. E-mail: jjnieto{at}cica.es.

Applied and Environmental Microbiology, October 1998, p. 4095-4097, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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