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Research Article

Influence of substrate structure on disintegration activity of Moloney murine leukemia virus integrase.

G A Donzella, C B Jonsson, M J Roth
G A Donzella
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C B Jonsson
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M J Roth
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ABSTRACT

The disintegration activity of Moloney murine leukemia virus (M-MuLV) integrase (IN) was investigated through structural and sequence modifications of a Y substrate that resembles an integration intermediate. The Y substrates, constructed from individual oligonucleotides, contain a single viral long terminal repeat (LTR) joined to a nicked target DNA. Truncation of the double-stranded LTR sequences distal to the conserved 5'-CA-3' dinucleotide progressively diminished disintegration activity. M-MuLV IN was also able to catalyze disintegration of a heterologous double-stranded LTR sequence. Significantly, the activity of M-MuLV IN on single-stranded LTR Y substrates was more dependent on the sequence and length of the LTR strand than that reported for human immunodeficiency virus type 1 (HIV-1) IN. Modifications introduced at the Y-substrate junction demonstrated that the 3'-hydroxyl group at the terminus of the target strand was necessary for efficient joining of the target DNA strands. The presence of a 2'-hydroxyl group at the 3' end of the target strand, as well as a single-nucleotide gap at the LTR-target junction, reduced disintegration activity. The absence of hydroxyl groups on the terminal nucleotide abolished joining of the target strands. The results presented here suggest that M-MuLV IN disintegration activity is dependent on substantially different LTR sequence requirements than those reported for HIV-1 IN and may be mediated primarily through a structural recognition event.

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Influence of substrate structure on disintegration activity of Moloney murine leukemia virus integrase.
G A Donzella, C B Jonsson, M J Roth
Journal of Virology Dec 1993, 67 (12) 7077-7087; DOI:

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Influence of substrate structure on disintegration activity of Moloney murine leukemia virus integrase.
G A Donzella, C B Jonsson, M J Roth
Journal of Virology Dec 1993, 67 (12) 7077-7087; DOI:
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