Influence of subterminal viral DNA nucleotides on differential susceptibility to cleavage by human immunodeficiency virus type 1 and visna virus integrases

Michael Katzman, Malgorzata Sudol

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

A comparison of the extents of site-specific cleavage of U5 and U3 viral DNA termini by the integrases of human immunodeficiency virus type 1 and visna virus guided the quantitative testing of oligonucleotide substrates containing specific base substitutions. The simultaneous exchange of positions 5 and 6 between U3 substrates switched the patterns of differential susceptibility to the two integrases. The activity of visna virus integrase was more dependent on the identity of position 5 adjacent to the invariant CA bases than on position 6, whereas human immunodeficiency virus type 1 integrase appeared to interact even more critically with position 6. Although the paired natural substrates of most lentiviral integrases match at positions 7 and 8, these bases were nut important for susceptibility of U5 substrates. In fact, the final six U5 positions contained all of the sequence information necessary for susceptibility. These results suggest that constraints other than integration influence the terminal inverted repeats of retroviral DNA.

Original languageEnglish (US)
Pages (from-to)9069-9073
Number of pages5
JournalJournal of virology
Volume70
Issue number12
DOIs
StatePublished - Dec 1996

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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