d-Allose Catabolism of Escherichia coli: Involvement of alsI and Regulation of als Regulon Expression by Allose and Ribose
AUTOR(ES)
Poulsen, Tim S.
FONTE
American Society for Microbiology
RESUMO
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 β-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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=94189Documentos Relacionados
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