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Journal of Bacteriology, November 1998, p. 5559-5566, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Molecular Characterization and Regulation of an Operon Encoding a System for Transport of Arginine and Ornithine and the ArgR Regulatory Protein in Pseudomonas aeruginosa

Takayuki Nishijyo,1 Seung-Moon Park,1,2 Chung-Dar Lu,2 Yoshifumi Itoh,1 and Ahmed T. Abdelal2,*

National Food Research Institute, Tsukuba, Ibaraki 305, Japan,1 and Department of Biology, Georgia State University, Atlanta, Georgia 30302-40382

Received 7 July 1998/Accepted 2 September 1998

The complete nucleotide sequence for the aot operon of Pseudomonas aeruginosa PAO1 was determined. This operon contains six open reading frames. The derived sequences for four of these, aotJ, aotQ, aotM, and aotP, show high similarity to those of components of the periplasmic binding protein-dependent ABC (ATP binding cassette) transporters of enteric bacteria. Transport studies with deletion derivatives established that these four genes function in arginine-inducible uptake of arginine and ornithine but not lysine. The aotO gene, which encodes a polypeptide with no significant similarity to any known proteins, is not essential for arginine and ornithine uptake. The sixth and terminal gene in the operon encodes ArgR, which has been recently shown to function in regulation of arginine metabolism. Studies with an aotJ::lacZ translational fusion showed that expression of the aot operon is strongly induced by arginine and that this effect is mediated by ArgR. S1 nuclease and primer extension experiments showed the presence of two promoters, P1 and P2. The downstream promoter, P2, is induced by arginine and appears to be subject to carbon catabolite repression. The upstream promoter, P1, is induced by glutamate. Footprinting experiments established the presence of a 44-bp ArgR binding site that overlaps the -35 region for P2, as was shown to be the case for the arginine-inducible aru promoter, and the -10 region for P1, as was shown to be the case for arginine-repressible operons in P. aeruginosa. Sequence alignment confirms the architecture and the consensus sequence of the ArgR binding sites, as was previously reported.

* Corresponding author. Mailing address: College of Arts and Sciences, Georgia State University, P.O. Box 4038, Atlanta, GA 30302-4038. Phone: (404) 651-1410. Fax: (404) 651-4739. E-mail: aabdelal{at}gsu.edu.

Journal of Bacteriology, November 1998, p. 5559-5566, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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