Nucleic Acids Research, 1993, Vol. 21, No. 15 3373-3377
© 1993
MOLECULAR BIOLOGY |
Identification of amino acids in HIV-2 integrase involved in site-specific hydrolysis and alcoholysis of viral DNA termini
Division of Molecular Biology, The Netherlands Cancer Institute Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
*To whom correspondence should be addressed
Received May 11, 1993. Revised June 17, 1993. Accepted June 17, 1993.
The human immunodeficiency virus integrase (HIV IN) protein cleaves two nucleotides off the 3' end of viral DNA and subsequently integrates the viral DNA into target DNA. IN exposes a specific phosphodiester bond near the viral DNA end to nucleophilic attack by water or other nucleophiles, such as glycerol or the 3' hydroxyl group of the viral DNA molecule itself. Wild-type IN has a preference for water as the nucleophile; we here describe a class of IN mutants that preferentially use the 3' hydroxyl group of viral DNA as nucleophile. The amino acids that are altered in this class of mutants map near the putative active-site residues Asp-116 and Glu-152. These results support a model in which multiple amino acid side-chains are involved in presentation of the (soluble) nucleophile. IN is probably active as an oligomeric complex, in which the subunits have non-equivalent roles; we here report that nucleophile selection is determined by the subunit that supplies the active site.
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