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