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• W2034860018 abstract "The binding of purified simian virus 40 (SV40) large T antigen (T) from monkey cells infected with wild-type SV40 virus to viral replication origin-containing DNA fragments was studied by DNase footprinting and restriction endonuclease protection methods. A strong affinity binding site (site 1) of 30 base-pairs and a second, adjacent 40 base-pair lower affinity binding site (site 2), which includes the origin of replication, were detected in these assays. These sites appear identical to those previously noted in similar assays performed with the Ad2 + D2 (D2) T protein. Heating T prior to incubation with DNA significantly increased the binding to these two sites, and the order of binding did not change. Moreover, protection of sequences was observed on both strands in these two sites suggesting that both strands can participate in binding of T to these two sites. Studies with DNAs from two internal site 2 deletion mutants as well as with a DNA fragment lacking the distal 13 base-pairs of site 2 revealed that sequences in the early portion of site 2 are sufficient for T binding to the intact site. Furthermore, use of a new assay that measures protection of DNA sequences from specific restriction enzyme cleavage revealed that site 2 can be subdivided into two subsites, 2A and 2B, where 2A corresponds to the above-noted early segment of this locus. In titration experiments, the affinity of 2A for T was greater than that of 2B. Hence, binding to a major portion of the replication initiation sequence (i.e. site 2) is the product of at least two interactions. Finally, analyses performed with DNA from a site 1 deletion mutant, cs1085, revealed that prior binding of T to this locus did not facilitate its binding to site 2. The opposite effect was observed when D2T was employed in these assays. Thus, although similar in many respects, these proteins display a detectable difference in their DNA binding mechanisms." @default.
• W2034860018 created "2016-06-24" @default.
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• W2034860018 date "1983-08-01" @default.
• W2034860018 modified "2023-09-27" @default.
• W2034860018 title "Binding of simian virus 40 large T antigen from virus-infected monkey cells to wild-type and mutant viral replication origins" @default.
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• W2034860018 doi "https://doi.org/10.1016/s0022-2836(83)80075-8" @default.
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