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. 1983 Nov;80(22):6745–6749. doi: 10.1073/pnas.80.22.6745

Selective cleavage in the avian retroviral long terminal repeat sequence by the endonuclease associated with the alpha beta form of avian reverse transcriptase.

G Duyk, J Leis, M Longiaru, A M Skalka
PMCID: PMC390062  PMID: 6196775

Abstract

M13 recombinant DNA clones containing a 350-base sequence derived from the EcoRI fragment of two tandemly linked Rous-associated virus 2 (RAV-2) long terminal repeat (LTR) sequences have been used to map reverse transcriptase-associated endonuclease (RT-endonuclease) cleavage sites by primer extension studies. Under appropriate conditions, the alpha beta form of RT-endonuclease (composed of both the alpha and beta subunits) purified from Avian sarcoma virus (Pr-C and B-77 strains) introduces a specific break in the inverted complementary repeat sequence found at the junction of the LTRs. The cleavage sites occur in the same nucleotide sequence in (-) and (+) DNA strands; together they have the potential of generating a 6-base-pair staggered overlap that spans the junction. This supports the notion that the enzyme is involved in viral DNA integration. Other RT-endonuclease sites were analyzed. A second site, which occurs in the lac region of the M13 vector DNA upstream from the unique EcoRI cloning site, bears no apparent sequence homology to the site at the junction of the LTRs. However, it also lies within an inverted complementary repeat and, as is the case for the site in the LTR, the break occurs to the 5' side of the axis of symmetry. Cleavage at this second site is suppressed when the vector contains the RAV-2 LTR insert. Thus, the viral LTR appears to exert a cis effect that can influence a region over 300 base pairs away.

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