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- W1715083692 abstract "From an Escherichia coli K-12 strain lacking adenylate cyclase (cya) and cyclic AMP receptor protein (crp), two mutants were isolated that synthesize uridine phosphorylase constitutively. The mutations differ from one another and also from a wild type in the maximum rate of uridine phosphorylase synthesis. They have constitutive expression of the uridine phosphorylase gene (udp) in the presence of repressor protein coded by the cytR regulatory gene and decrease the sensitivity of the udp gene simultaneously with catabolite repression. Both mutations cause a high level of udp expression whether they are in a cya crp or in a cya+ crp+ background. Another mutation (udpP1) isolated previously alters the response of udp gene to the ctyR repressor and produces a higher constitutive level of uridine phosphorylase in a cytR+ than in a cytR background when bacteria are grown in glucose. The synthesis of uridine phosphorylase in this mutant is dependent on an intact cyclic AMP-cyclic AMP receptor protein complex. All mutations studied are cis-acting and extremely closely linked to the udp structural gene, and appear to affect the uridine phosphorylase promoter-operator region. The data obtained are in accordance with a suggestion that the cytR repressor protein normally asserts its function by preventing the positive action of cyclic AMP-cyclic AMP receptor protein complex." @default.
- W1715083692 created "2016-06-24" @default.
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- W1715083692 date "1979-02-01" @default.
- W1715083692 modified "2023-09-28" @default.
- W1715083692 title "Promoter-like mutants with increased expression of the Escherichia coli uridine phosphorylase structural gene" @default.
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- W1715083692 doi "https://doi.org/10.1128/jb.137.2.802-810.1979" @default.
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