Specificity and efficiency of thymidine incorporation in Escherichia coli lacking thymidine phosphorylase.

Journal of Bacteriology
W L Fangman

Abstract

A mutant of Escherichia coli lacking the catabolic enzyme thymidine phosphorylase readily incorporates exogenous thymidine into deoxyribonucleic acid (DNA) even when provided at concentrations as low as 0.2 mug/ml. Incorporation by this prototrophic strain occurs specifically into DNA, since, with radioactively labeled thymidine, (i) more than 98% is incorporated into alkali-stable material, (ii) at least 90% is recovered as thymine after brief formic acid hydrolysis, and (iii) at least 90% is incorporated into material with the buoyant density of DNA. During growth in medium containing thymidine, the bacteria obtain approximately half of their DNA thymines from the exogenous thymidine and half from endogenous synthesis. The thymines and cytosines of DNA can be simultaneously and specifically labeled by thymidine-2-(14)C and uridine-5-(3)H, respectively. The mutant, which does not degrade thymidine, retains the ability to degrade the thymidine analogue 5-bromodeoxyuridine.

References

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Citations

May 2, 1977·European Journal of Biochemistry·J C LeerM Schwartz
Jan 1, 1971·Molecular & General Genetics : MGG·W L Fangman, M Russel
Aug 5, 1991·Biotechnology and Bioengineering·R H KuhnD F Ollis
May 27, 2014·Journal of Bacteriology·Ngoc Q TranCharles C Richardson
Feb 21, 1974·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·R H Pritchard
Jan 1, 1972·Acta Pathologica Et Microbiologica Scandinavica. Section B: Microbiology and Immunology·S Jyssum
Apr 1, 1972·Journal of Bacteriology·C F BeckE Thomassen
Sep 1, 1970·Bacteriological Reviews·G A O'Donovan, J Neuhard
Jul 1, 1976·Cell·M A Forte, W L Fangman

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