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- W2000504635 abstract "The vaccinia virus early transcription factor (VETF), a heterodimeric protein composed of 82- and 70-kDa subunits, interacts with viral early promoters at both a sequence-specific core region upstream and a sequence-independent region downstream of the RNA start site. To determine the VETF subunit-promoter interactions, 32P-labeled DNA targets were chemically synthesized with uniquely positioned phosphorothioates to which azidophenacyl bromide moieties were coupled. After incubating the derivatized promoter with VETF and exposing the complex to 302-nm light, the protein was denatured and the individual subunits with or without covalently bound DNA were isolated with specific antiserum and analyzed by SDS/polyacrylamide gel electrophoresis. Using a set of 26 duplex probes, with uniquely positioned aryl azide moieties on the coding or template strands, we found that the 82-kDa subunit interacted primarily with the core region of the promoter, whereas the 70-kDa subunit interacted with the downstream region. Nucleotide substitutions in the core region that downregulate transcription affected the binding of both subunits: the 82-kDa subunit no longer exhibited specificity for upstream regions of the promoter but also bound to downstream regions, whereas the binding of the 70-kDa subunit was abolished even though the mutations were far upstream of its binding site. These results suggested mechanisms by which the interaction of the 82-kDa subunit with the core sequence directs binding of the 70-kDa subunit to DNA downstream." @default.
- W2000504635 created "2016-06-24" @default.
- W2000504635 creator A5035265346 @default.
- W2000504635 creator A5046574221 @default.
- W2000504635 date "1996-07-23" @default.
- W2000504635 modified "2023-10-14" @default.
- W2000504635 title "Interaction of the 82-kDa subunit of the vaccinia virus early transcription factor heterodimer with the promoter core sequence directs downstream DNA binding of the 70-kDa subunit." @default.
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- W2000504635 doi "https://doi.org/10.1073/pnas.93.15.7540" @default.
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