Summary
Non-photoreactivable endonuclease V-sensitive sites have been detected in the DNA of wild type bacteriophage T4 irradiated with near UV light (320 nm). Such sites were not detected in the DNA of (a) wild type T4 irradiated with far UV (254 nm) or (b) in T4 mutants in which non-glucosylated 5-hydroxy-methylcytosine (5HMC) or cytosine replaces glucosylated 5HMC normally present in T4, irradiated with 320 nm or 254 nm light. Although the non-photoreactivable sites accounted for ∼50% of the endonuclease V-sensitive sites in the DNA of glucosylated T4 irradiated with near UV, there was very little difference in the sensitivities of T4 containing glucosylated 5HMC, non-glucosylated 5HMC and cytosine to near UV (313 nm). We propose that the photoproduct responsible for the non-photoreactivable, but endonuclease V-sensitive, sites in glucosylated DNA is formed from glucosylated 5HMC and that a similar photoproduct is formed from non-glucosylated 5HMC or cytosine in the appropriate phage strains. We further propose that the glucosylated 5HMC photoproduct is non-photoreactivable whereas the cytosine and non-glucosylated 5HMC photoproducts are photoreactivable and are therefore possibly cyclobutane dimers.
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AECL Refence No. 6370
Communicated by B.A. Bridges
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Childs, J.D., Paterson, M.C., Smith, B.P. et al. Evidence for a near UV-induced photoproduct of 5-hydroxymethylcytosine in bacteriophage T4 that can be recognized by endonuclease V. Molec. Gen. Genet. 167, 105–112 (1978). https://doi.org/10.1007/BF00270326
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DOI: https://doi.org/10.1007/BF00270326