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Journal of Bacteriology, December 1998, p. 6325-6331, Vol. 180, No. 23
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Mutational Analysis of the Rhizobium etli recA Operator

Angels Tapias and Jordi Barbé*

Molecular Microbiology and Bacterial Genetics Group, Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Bellaterra, 08193-Barcelona, Spain

Received 12 June 1998/Accepted 24 September 1998

Based upon our earlier studies (A. Tapias, A. R. Fernández de Henestrosa, and J. Barbé, J. Bacteriol. 179:1573-1579, 1997) we hypothesized that the regulatory sequence of the Rhizobium etli recA gene was TTGN11CAA. However, further detailed analysis of the R. etli recA operator described in the present work suggests that it may in fact be GAACN7GTAC. This new conclusion is based upon PCR mutagenesis analysis carried out in the R. etli recA operator, which indicates that the GAAC and GTAC submotifs found in the sequence GAACN7GTAC are required for the maximal stimulation of in vivo transcription and in vitro DNA-protein complex formation. This DNA-protein complex is also detected when the GAACN7GTAC wild-type sequence is modified to obtain GAACN7GAAC, GTACN7GTAC, or GAACN7GTTC. The wild-type promoters of the Rhizobium meliloti and Agrobacterium tumefaciens recA genes, which also contain the GAACN7GTAC sequence, compete with the R. etli recA promoter for the DNA-protein complex formation but not with mutant derivatives in any of these motifs, indicating that the R. etli, R. meliloti, and A. tumefaciens recA genes present the same regulatory sequence.

* Corresponding author. Mailing address: Department of Genetics and Microbiology, Faculty of Sciences, Universitat Autònoma de Barcelona, Bellaterra, 08193-Barcelona, Spain. Phone: 34-93-5811837. Fax: 34-93-5812387. E-mail: jbarbe{at}cc.uab.es.

Journal of Bacteriology, December 1998, p. 6325-6331, Vol. 180, No. 23
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

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