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J Virol. 1984 May; 50(2): 309-315

Characterization of the DNA-protein complex at the termini of the bacteriophage PRD1 genome.

ABSTRACT

DNA of bacteriophage PRD1 has protein P8 at its termini. Extracts of infected cells are able to derivatize P8 in vitro with labeled dGTP. Two early proteins, P1 and P8, products of genes I and VIII, respectively, are the only phage proteins necessary for the formation of the protein P8-dGMP complex. This was shown by complementation of extracts from cells infected with mutants and by use of extracts from cells carrying cloned genes I and VIII. With Escherichia coli mutants that are temperature sensitive for DNA synthesis, it was possible to show that the formation of the protein P8-dGMP complex was dependent upon the host replication apparatus. The analysis of the purified protein P8-dGMP complex by hydrolysis and enzymatic digestion showed that there is a covalent phosphodiester bond between tyrosine and 5'-dGMP.

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