Unwinding-like activity associated with avian retrovirus RNA-directed DNA polymerase - PubMed (original) (raw)

Unwinding-like activity associated with avian retrovirus RNA-directed DNA polymerase

M S Collett et al. J Virol. 1978 May.

Abstract

The avian retrovirus RNA-directed DNA polymerase contains an activity that is capable of removing hydrogen bonds from duplex nucleic acid molecules. This "unwinding-like" activity appears to be specific in its action, affecting RNA.DNA and DNA.DNA duplex molecules but not RNA.RNA duplexes. Studies with defined RNA.DNA hybrid molecules (e.g., Rous sarcoma virus RNA and complementary DNAs representing specific regions of the Rous sarcoma virus genome) and DNA.DNA duplexes indicate that, although this activity can remove a portion of the hydrogen bonds from these double-stranded structures, complete separation of complementary strands is not accomplished. The unwinding-like activity exhibits sensitivities to temperature and monovalent and divalent cation concentrations. It can also remove a specific large oligonucleotide from the 5' end of the viral genome subsequent to RNase H hydrolysis of viral RNA complexed to DNA present at that terminus. This reverse transcriptase-associated unwinding-like activity is discussed with respect to recently proposed models of retrovirus proviral DNA synthesis.

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Biographical Feature: Marc S. Collett (23 May 1951-11 June 2022): the Battle against Viral Disease Has Lost a Valiant Warrior, and the World Has Lost a Splendid Human Being.
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Unwinding-like activity associated with avian retrovirus RNA-directed DNA polymerase - PubMed (original) (raw)