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| Content Provider | PubMed Central |
|---|---|
| Author | Kassavetis, George A. Soragni, Elisabetta Driscoll, Robert Peter, Geiduschek E. |
| Copyright Year | 2005 |
| Abstract | Transcription factor (TF) IIIB, the central transcription initiation factor of RNA polymerase III (pol III), is composed of three subunits, Bdp1, Brf1 and TATA-binding protein (TBP), all essential for normal function in vivo and in vitro. Brf1 is a modular protein: Its N-proximal half is related to TFIIB and binds similarly to the C-terminal stirrup of TBP; its C-proximal one-third provides most of the affinity for TBP by binding along the entire length of the convex surface and N-terminal lateral face of TBP. A structure-informed triple fusion protein, with TBP core placed between the N- and C-proximal domains of Brf1, has been constructed. The Brf1-TBP triple fusion protein effectively replaces both Brf1 and TBP in TFIIIC-dependent and -independent transcription in vitro, and forms extremely stable TFIIIB–DNA complexes that are indistinguishable from wild-type TFIIIB–DNA complexes by chemical nuclease footprinting. Unlike Brf1 and TBP, the triple fusion protein is able to recruit pol III for TATA box-directed transcription of linear and supercoiled DNA in the absence of Bdp1. The Brf1-TBP triple fusion protein also effectively replaces Brf1 function in vivo as the intact protein, creating a TBP paralogue in yeast that is privatized for pol III transcription. |
| Related Links | http://dx.doi.org/10.1073/pnas.0507653102 |
| Ending Page | 15411 |
| Page Count | 6 |
| Starting Page | 15406 |
| File Format | |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 43 |
| Volume Number | 102 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2005-10-25 |
| Access Restriction | Open |
| Rights Holder | National Academy of Sciences |
| Subject Keyword | General Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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