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JBC, Vol. 250, Issue 15, 5995-6001, Aug, 1975
dnaG gene product, a rifampicin-resistant RNA polymerase, initiates the conversion of a single-stranded coliphage DNA to its duplex replicative form
J. P. Bouche, K. Zechel and A. Kornberg
The protein responsible for the initiation of conversion of single-stranded
phage G4 DNA to the duplex replicative form has been purified approximately
3000-fold and identified with Escherichia coli dnaG gene product. The
protein is a rifampicin-resistant RNA polymerase of approximately 64,000
daltons. It catalyzes the incorporation of the four ribonucleoside
triphosphates into an oligoribonucleotide, using as template the
single-stranded DNA coated with the DNA unwinding protein of E. coli. An
RNA transcript of a unique region of the chromosome can serve as a primer
by covalent extension by DNA polymerase III holoenzyme to form a nearly
full-length linear complementary strand. A similar role for the dnaG
protein in the initiation of nascent (Okazaki) fragments in replication of
the host chromosome is discussed.

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Copyright © 1975 by the American Society for Biochemistry and Molecular Biology.
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