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Journal of Bacteriology, August 2001, p. 4659-4663, Vol. 183, No. 15
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.15.4659-4663.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Activation by Gene Amplification of pitB, Encoding a Third Phosphate Transporter of Escherichia coli K-12

Sally M. Hoffer,1 Paul Schoondermark,1 Hendrik W. van Veen,2,dagger and Jan Tommassen1,*

Department of Molecular Microbiology and Institute of Biomembranes, Utrecht University, 3584 CH Utrecht,1 and Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, 9751 NN Haren,2 The Netherlands

Received 22 December 2000/Accepted 8 May 2001

Two systems for the uptake of inorganic phosphate (Pi) in Escherichia coli, PitA and Pst, have been described. A revertant of a pitA pstS double mutant that could grow on Pi was isolated. We demonstrate that the expression of a new Pi transporter, PitB, is activated in this strain by a gene amplification event.

* Corresponding author. Mailing address: Department of Molecular Microbiology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. Phone: (31) 30 2532999. Fax: (31) 30 2513655. E-mail: J.P.M.Tommassen{at}bio.uu.nl.

dagger Present address: Department of Pharmacology, University of Cambridge, Cambridge CB2 1QJ, United Kingdom.

Journal of Bacteriology, August 2001, p. 4659-4663, Vol. 183, No. 15
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.15.4659-4663.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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