Abstract
The general transcription factors (GTFs) of eukaryotic RNA polymerase II, in a process facilitated by regulatory and accessory factors, target promoters through synergistic interactions with core elements. The specific binding of the TATA box–binding protein (TBP) to the TATA box has led to the assumption that GTFs recognize promoters directly, producing a preinitiation complex at a defined position. Using biochemical analysis as well as biophysical single-pair Förster resonance energy transfer, we now provide evidence that negative cofactor-2 (NC2) induces dynamic conformational changes in the TBP–DNA complex that allow it to escape and return to TATA-binding mode. This can lead to movement of TBP along the DNA away from TATA.
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Acknowledgements
We thank C. Goebel for excellent technical assistance, A. Lammens and D. Niessing for help with modeling of the TBP–DNA structure, T. Weil (Vanderbilt University) for providing the single-cysteine mutant of TBP, R.G. Roeder, L. Tora, P. Cramer and C. Bräuchle for crucial advice, and J. Michaelis (Ludwig Maximilian University Munich) for providing the MatLab software. This work was supported by grants from the Ludwig Maximilian University, Center for Nanoscience (CeNS), the German Excellence Initiative via the Nanosystems Initiative Munich and the Center for Integrated Protein Science (CiPS) Munich, Helmholtz Center Munich German Research Center for Environmental Health, and the Deutsche Forschungsgemeinschaft (SFB 646) to M.M. and D.C.L.
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P.S. built the single-molecule total internal reflection fluorescence microscope, performed all the single-molecule measurements, developed the analysis software and analyzed the single-molecule data. G.S. and E.P. performed biochemical analyses. D.C.L. and M.M. designed experiments and supervised the project.
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Supplementary Figures 1–8, Supplementary Table, Supplementary Discussion, Supplementary Methods (PDF 891 kb)
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Schluesche, P., Stelzer, G., Piaia, E. et al. NC2 mobilizes TBP on core promoter TATA boxes. Nat Struct Mol Biol 14, 1196–1201 (2007). https://doi.org/10.1038/nsmb1328
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DOI: https://doi.org/10.1038/nsmb1328
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