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• W1998762260 abstract "We previously reported the purification and characterization of the polyhedrin promoter-binding protein (PPBP), an unusual DNA-binding protein that interacts with transcriptionally important motifs of the baculovirus polyhedrin gene promoter (S. Burma, B. Mukherjee, A. Jain, S. Habib, and S.E. Hasnain, J. Biol. Chem.(1994) 269, 2750-2757. PPBP also exhibits a sequence-specific single-stranded DNA-binding activity. Gel retardations and competition analyses with double- and single-stranded oligonucleotides indicated that PPBP binds the coding strand and not the noncoding strand of the promoter. This was further confirmed by UV cross-linking and Southwestern blotting experiments. Gel retardations with mutated oligonucleotides indicated that both dsDNA and ssDNA binding involve common AATAAATAAGTATT motifs. However, ssDNA binding is dependent upon ionic interactions unlike dsDNA binding, which is mainly through nonionic interactions. The affinity of PPBP for the coding strand appears to be higher than that for duplex promoter DNA. Interestingly, the PPBP-coding strand complex has a longer half-life (∼60 min) than the PPBP-duplex promoter complex (∼15 min). PPBP represents a unique example of an “initiator” promoter-binding protein with dual dsDNA and ssDNA binding activities, and this reconciles very well with the unusual binding characteristics displayed by it. The formation of the PPBP-coding strand complex in vivo may be a crucial step for the exceptionally high and repeated rounds of transcriptional activity of the baculovirus polyhedrin gene promoter. We previously reported the purification and characterization of the polyhedrin promoter-binding protein (PPBP), an unusual DNA-binding protein that interacts with transcriptionally important motifs of the baculovirus polyhedrin gene promoter (S. Burma, B. Mukherjee, A. Jain, S. Habib, and S.E. Hasnain, J. Biol. Chem.(1994) 269, 2750-2757. PPBP also exhibits a sequence-specific single-stranded DNA-binding activity. Gel retardations and competition analyses with double- and single-stranded oligonucleotides indicated that PPBP binds the coding strand and not the noncoding strand of the promoter. This was further confirmed by UV cross-linking and Southwestern blotting experiments. Gel retardations with mutated oligonucleotides indicated that both dsDNA and ssDNA binding involve common AATAAATAAGTATT motifs. However, ssDNA binding is dependent upon ionic interactions unlike dsDNA binding, which is mainly through nonionic interactions. The affinity of PPBP for the coding strand appears to be higher than that for duplex promoter DNA. Interestingly, the PPBP-coding strand complex has a longer half-life (∼60 min) than the PPBP-duplex promoter complex (∼15 min). PPBP represents a unique example of an “initiator” promoter-binding protein with dual dsDNA and ssDNA binding activities, and this reconciles very well with the unusual binding characteristics displayed by it. The formation of the PPBP-coding strand complex in vivo may be a crucial step for the exceptionally high and repeated rounds of transcriptional activity of the baculovirus polyhedrin gene promoter." @default.
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• W1998762260 date "1995-03-01" @default.
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• W1998762260 title "The 30-kDa Protein Binding to the “Initiator” of the Baculovirus Polyhedrin Promoter Also Binds Specifically to the Coding Strand" @default.
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• W1998762260 doi "https://doi.org/10.1074/jbc.270.9.4405" @default.
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