Recognition of altered deoxyribonucleic acid in recombination.

Journal of Bacteriology
R B Helling

Abstract

Kinetics of inactivation of transduction by phage P1bt which had been treated with ultraviolet light (UV) or nitrous acid (NA) was examined. With Escherichia coli B/r (radiation-resistant), low doses of UV increased transduction frequency, but the frequency was exponentially inactivated by higher doses. Little initial stimulus was observed in strain B(s-1) (radiation-sensitive). The final rate of decay was the same as in B/r. The initial stimulus of transduction in B/r was probably a consequence of increased recombination resulting from dark repair. It was estimated that another nucleotide within 1000 nucleotide pairs had to be damaged by UV to prevent a given nucleotide from successful transduction. The NA dose response was the same for the two strains. An initial stimulus of transduction was followed by exponential decline. The UV-repair enzymes missing in B(s-1) were not required for repair of NA-induced damage to transducing or lytic phage DNA. Low recovery of new mutations in the transductants showed that mutagen-induced damage to transducing DNA was excluded from recombinant chromosomes. The few recovered mutants may have resulted from "normal" error in recombination.

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Citations

Jan 1, 1972·Molecular & General Genetics : MGG·A Adams, M Oishi
Aug 1, 1975·Journal of Virology·H Drexler, K J Kylberg
Jan 1, 1977·Mutation Research·F Zimmermann
Dec 10, 1973·Biochemical and Biophysical Research Communications·R B Helling

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