beta-Galactosidase and tryptophanase can be induced in Escherichia coli simultaneously or gradually during a batch cultivation. In the strain Escherichia coli K 12 and ML 30, in which the synthesis of the two enzymes was induced simultaneously, only the synthesis of tryptophanase partially decreased, whereas the synthesis of beta-galactosidase was not influenced. In the strains B 28 and ATCC 9637 the synthesis of both enzymes was partially decreased. On a gradual induction of these enzymes in the strain Escherichia coli K 12 only the synthesis of tryptophanase decreased. Thus, the results obtained here resemble those observed during the simultaneous induction. In addition, it was found that it is not important which of the two enzymes is induced as the first one.

Zobrazit více v PubMed

Biochim Biophys Acta. 1951 Nov;7(4):585-99 PubMed

J Mol Biol. 1961 Jun;3:318-56 PubMed

J Mol Biol. 1967 Aug 14;27(3):495-506 PubMed

J Mol Biol. 1967 Aug 14;27(3):475-94 PubMed

Folia Microbiol (Praha). 1972;17(3):170-83 PubMed

J Bacteriol. 1950 Oct;60(4):381-92 PubMed

Folia Microbiol (Praha). 1973;18(5):368-75 PubMed

Sci Am. 1975 Feb;232(2):46-57 PubMed

Catabolite repression during single and multiple induction in Escherichia coli

Simultaneous induction of three catabolic enzymes in Escherichia coli

Effect of cyclic adenosine-3',5'-monophosphate on the simultaneous synthesis of beta-galactosidase and tryptophanase in Escherichia coli

Simultaneous and successive induction of synthesis of beta-galactosidase and tryptophanase in Escherichia coli K 12 in the chemostat