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 Previous Article

Journal of Bacteriology, May 2000, p. 2672-2674, Vol. 182, No. 9
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

A Common Regulator for the Operons Encoding the Enzymes Involved in D-Galactarate, D-Glucarate, and D-Glycerate Utilization in Escherichia coli

Rafael Monterrubio, Laura Baldoma, Nuria Obradors, Juan Aguilar, and Josefa Badia*

Department of Biochemistry, Faculty of Pharmacy, University of Barcelona, 08028 Barcelona, Spain

Received 17 November 1999/Accepted 1 February 2000

Genes for D-galactarate (gar) and D-glucarate (gud) metabolism in Escherichia coli are organized in three transcriptional units: garD, garPLRK, and gudPD. Two observations suggested a common regulator for the three operons. (i) Their expression was triggered by D-galactarate, D-glucarate, and D-glycerate. (ii) Metabolism of the three compounds was impaired by a single Tn5 insertion mapped in the yaeG gene (proposed name, sdaR), outside the D-galactarate and D-glucarate systems. Expression of the sdaR gene is autogenously regulated.

* Corresponding author. Mailing address: Departamento de Bioquímica, Facultad de Farmacia, Universidad de Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain. Phone: 34-93-402 4521. Fax: 34-93-402 1896. E-mail: Palaciu{at}farmacia.far.ub.es.

Journal of Bacteriology, May 2000, p. 2672-2674, Vol. 182, No. 9
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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