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Journal of Bacteriology, November 1999, p. 7126-7130, Vol. 181, No. 22
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

D-Allose Catabolism of Escherichia coli: Involvement of alsI and Regulation of als Regulon Expression by Allose and Ribose

Tim S. Poulsen, Ying-Ying Chang,dagger and Bjarne Hove-Jensen*

Department of Biological Chemistry, Institute of Molecular Biology, University of Copenhagen, Copenhagen, Denmark

Received 2 August 1999/Accepted 8 September 1999

Genes involved in allose utilization of Escherichia coli K-12 are organized in at least two operons, alsRBACE and alsI, located next to each other on the chromosome but divergently transcribed. Mutants defective in alsI (allose 6-phosphate isomerase gene) and alsE (allulose 6-phosphate epimerase gene) were Als-. Transcription of the two allose operons, measured as beta -galactosidase activity specified by alsI-lacZ+ or alsE-lacZ+ operon fusions, was induced by allose. Ribose also caused derepression of expression of the regulon under conditions in which ribose phosphate catabolism was impaired.

* Corresponding author. Mailing address: Department of Biological Chemistry, Institute of Molecular Biology, University of Copenhagen, 83H Sølvgade, DK-1307 Copenhagen K, Denmark. Phone: 45 3532 2027. Fax: 45 3532 2040. E-mail: hove{at}mermaid.molbio.ku.dk.

dagger Permanent address: Department of Microbiology, University of Illinois, Urbana, IL 61801.

Journal of Bacteriology, November 1999, p. 7126-7130, Vol. 181, No. 22
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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