title: Role of the nonspecific DNA-binding region and alpha helices within the core domain of retroviral integrase in selecting target DNA sites for integration.
abstract: Retroviral integrase plays an important role in choosing host chromosomal sites for integration of the cDNA copy of the viral genome. The domain responsible for target site selection has been previously mapped to the central core of the protein (amino acid residues 49-238). Chimeric integrases between human immunodeficiency virus type 1 (HIV-1) and feline immunodeficiency virus (FIV) were prepared to examine the involvement of a nonspecific DNA-binding region (residues 213-266) and certain alpha helices within the core domain in target site selection. Determination of the distribution and frequency of integration events of the chimeric integrases narrowed the target site-specifying motif to within residues 49-187 and showed that alpha 3 and alpha 4 helices (residues 123-166) were not involved in target site selection. Furthermore, the chimera with the alpha 2 helix (residues 118-121) of FIV identity displayed characteristic integration events from both HIV-1 and FIV integrases. The results indicate that the alpha 2 helix plays a role in target site preference as either part of a larger or multiple target site-specifying motif.
authors.affiliation: Department of Molecular and Medical Pharmacology, Molecular Biology Institute, and UCLA AIDS Institute, UCLA School of Medicine, Los Angeles, California 90095, USA.
authors.forename: R S
authors.initials: RS
authors.lastname: Appa
authors.forename: C G
authors.initials: CG
authors.lastname: Shin
authors.forename: P
authors.initials: P
authors.lastname: Lee
authors.forename: S A
authors.initials: SA
authors.lastname: Chow
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D001483:Base Sequence; D001665:Binding Sites; D015153:Blotting, Western; D002384:Catalysis; D017931:DNA Primers; D004279:DNA, Viral / Q000378:metabolism*; D019427:HIV Integrase / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D015497:HIV-1 / Q000201:enzymology* / Q000502:physiology; D016089:Immunodeficiency Virus, Feline / Q000201:enzymology; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D016662:Virus Integration
chemical_list: D017931:DNA Primers; D004279:DNA, Viral; D011993:Recombinant Fusion Proteins; D019427:HIV Integrase