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Katz RA , Gravuer K , Skalka AM
A preferred target DNA structure for retroviral integrase in vitro
Journal of Biological Chemistry. 1998 Sep 11;273(37) :24190-24195
AbstractThe retroviral integrase protein catalyzes the insertion of linear viral DNA ends into the host cell DNA. Although integration in vivo is not site-specific, the detection of local and regional preferences within cellular DNA suggests that the integration reaction can be influenced by specific features of host DNA or chromatin. Here we describe highly preferred in vivo integration sites for avian sarcoma virus and human immunodeficiency virus-1 integrases within the stems of plasmid DNA cruciform structures, The preferred sites are adjacent to the loops ire the cruciform and are strand- specific. We suggest that the observed preference is due to the end-like character of the stem loop structure that allows DNA unpairing. From these results we propose that such unpairing may enhance both the processing and the joining steps in the integration reaction, and perhaps other cellular recombination reactions as men.
NotesTimes Cited: 22 English Article 119JT J BIOL CHEM