Den V Gene of Bacteriophage T4 Codes for Both Pyrimidine Dimer-DNA Glycosylase and Apyrimidinic Endonuclease Activities

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 1981 Oct 1

PMID 6270375

Citations 21

Authors

S McMillan

H J Edenberg

E H Radany

R C Friedberg

E C Friedberg

Affiliations

Soon will be listed here.

Abstract

Recent studies have shown purified preparations of phage T4 UV DNA-incising activity (T4 UV endonuclease or endonuclease V of phage T4) contain a pyrimidine dimer-DNA glycosylase activity that catalyzes hydrolysis of the 5' glycosyl bond of dimerized pyrimidines in UV-irradiated DNA. Such enzyme preparations have also been shown to catalyze the hydrolysis of phosphodiester bonds in UV-irradiated DNA at a neutral pH, presumably reflecting the action of an apurinic/apyrimidinic endonuclease at the apyrimidinic sites created by the pyrimidine dimer-DNA glycosylase. In this study we found that preparations of T4 UV DNA-incising activity contained apurinic/apyrimidinic endonuclease activity that nicked depurinated form I simian virus 40 DNA. Apurinic/apyrimidinic endonuclease activity was also found in extracts of Escherichia coli infected with T4 denV+ phage. Extracts of cells infected with T4 denV mutants contained significantly lower levels of apurinic/apyrimidinic endonuclease activity; these levels were no greater than the levels present in extracts of uninfected cells. Furthermore, the addition of DNA containing apurinic or apyrimidinic sites to reactions containing UV-irradiated DNA and T4 enzyme resulted in competition for pyrimidine dimer-DNA glycosylase activity against the UV-irradiated DNA. On the basis of these results, we concluded that apurinic/apyrimidinic endonuclease activity is encoded by the denV gene of phage T4, the same gene that codes for pyrimidine dimer-DNA glycosylase activity.

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