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  • Title: Protein-binding properties of the putative AP-1 and ATF sequences in the feline immunodeficiency virus long terminal repeat.
    Author: Ikeda Y, Inoshima Y, Kawaguchi Y, Maeda K, Kohmoto M, Kai C, Miyazawa T, Mikami T.
    Journal: J Gen Virol; 1998 Jan; 79 ( Pt 1)():95-9. PubMed ID: 9460929.
    Abstract:
    Electrophoresis-mobility-shift assays with nuclear extracts from a feline renal cell line and a T-lymphoblastoid cell line revealed that the AP-1 and ATF sites of feline immunodeficiency virus (FIV) TM2 strain had similar protein-binding properties to those of FIV Petaluma strain and consensus sequences of AP-1 and ATF sites, and that nuclear factors binding to these sites differed between the two cell lines. Cross-competition and gel-supershift assays demonstrated that the AP-1 and ATF sites had similar protein-binding properties. The effects of internal deletions of AP-1 and/or ATF sites on the basal promoter activity were also examined. Although deletion of either site moderately reduced activity, a mutant deleted in both sites had dramatically reduced activity. Therefore, we suggest that these two sites co-operatively regulate transcriptional activity of the promoter.
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