Effect of galactose on beta-galactosidase synthesis in Escherichia coli K-12.
In: Journal of bacteriology, Jg. 97 (1969), Heft 1, S. 217
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Zugriff:
In wild-type strains of Escherichia coli K-12, the rate of thiomethylgalactoside (TMG)-induced beta-galactosidase synthesis is decreased in the presence of galactose or glucose. A spontaneous mutant of a K-12 strain, 58-161, which synthesizes beta-galactosidase at a low rate was isolated. In this mutant, galactose, after a lag of about one generation time, evoked the same final differential rate of enzyme synthesis as did the gratuitous inducer TMG. However, constitutive, TMG-induced and galactose-induced synthesis in the mutant were subject to inhibition by exogenous glucose. It is concluded that repression of beta-galactosidase synthesis derived from glucose is distinct from the inhibition derived from galactose.
Titel: |
Effect of galactose on beta-galactosidase synthesis in Escherichia coli K-12.
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Autor/in / Beteiligte Person: | Llanes, B ; McFall, E |
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Zeitschrift: | Journal of bacteriology, Jg. 97 (1969), Heft 1, S. 217 |
Veröffentlichung: | Washington, DC : American Society for Microbiology, 1969 |
Medientyp: | academicJournal |
ISSN: | 0021-9193 (print) |
DOI: | 10.1128/jb.97.1.217-222.1969 |
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