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• W1569371482 abstract "When a recA-lacZ protein fusion was cloned into phage lambda, the resulting transducing phage grew normally on wild-type Escherichia coli, but its growth was severely inhibited in lexA(Def) mutant strains that express recA constitutively at high levels. Mutants of the transducing phage that grew on the lexA(Def) strains were isolated and were found to affect production of the RecA-beta-galactosidase hybrid protein. Most mutants, including a number of nonsense mutants, were phenotypically LacZ-. LacZ+ mutants were also isolated; most of these expressed lower basal and induced levels of beta-galactosidase activity. DNA sequence analysis revealed that some of the LacZ+ mutations were in the recA promoter. One of these was found to prevent induction. Unexpectedly, three of the mutations that reduced expression were located in the recA structural gene, at codons 10, 11, and 12. Further analysis of the codon 10 mutant showed that it most likely affected translation since it had little effect on transcription as measured by beta-galactosidase synthesis from a recA-lacZ operon fusion. This expression defect was not limited to the protein fusion, since the codon 10 mutation also reduced synthesis of RecA protein when present in a complete recA gene. Analysis of the recA DNA sequence in the fusion revealed that each of the mutations at codons 10, 11, and 12 increases the homology between this region of the mRNA and a sequence found at codons 1 to 4. Thus, the secondary structure of the mutant recA mRNAs may be affecting translation." @default.
• W1569371482 created "2016-06-24" @default.
• W1569371482 creator A5052546138 @default.
• W1569371482 creator A5056083213 @default.
• W1569371482 date "1985-08-01" @default.
• W1569371482 modified "2023-09-23" @default.
• W1569371482 title "Direct selection of mutations reducing transcription or translation of the recA gene of Escherichia coli with a recA-lacZ protein fusion" @default.
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• W1569371482 doi "https://doi.org/10.1128/jb.163.2.748-755.1985" @default.
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