Structural highlights
Function
MED8_YEAST Component of the Mediator complex, a coactivator involved in the regulated transcription of nearly all RNA polymerase II-dependent genes. Mediator functions as a bridge to convey information from gene-specific regulatory proteins to the basal RNA polymerase II transcription machinery. The Mediator complex, having a compact conformation in its free form, is recruited to promoters by direct interactions with regulatory proteins and serves for the assembly of a functional preinitiation complex with RNA polymerase II and the general transcription factors. The Mediator complex unfolds to an extended conformation and partially surrounds RNA polymerase II, specifically interacting with the unphosphorylated form of the C-terminal domain (CTD) of RNA polymerase II. The Mediator complex dissociates from the RNA polymerase II holoenzyme and stays at the promoter when transcriptional elongation begins. MED8 binds to the consensus sequence 5'-[AC][AG]GAAAT-3' in both the UAS of SUC2 and the DRS2 of HXK2.[1] [2] [3] [4] [5] [6]
References
- ↑ Chaves RS, Herrero P, Moreno F. Med8, a subunit of the mediator CTD complex of RNA polymerase II, directly binds to regulatory elements of SUC2 and HXK2 genes. Biochem Biophys Res Commun. 1999 Jan 19;254(2):345-50. PMID:9918841 doi:https://dx.doi.org/10.1006/bbrc.1998.9954
- ↑ Moreno-Herrero F, Herrero P, Colchero J, Baro AM, Moreno F. Analysis by atomic force microscopy of Med8 binding to cis-acting regulatory elements of the SUC2 and HXK2 genes of saccharomyces cerevisiae. FEBS Lett. 1999 Oct 15;459(3):427-32. PMID:10526178
- ↑ Kang JS, Kim SH, Hwang MS, Han SJ, Lee YC, Kim YJ. The structural and functional organization of the yeast mediator complex. J Biol Chem. 2001 Nov 9;276(45):42003-10. Epub 2001 Sep 12. PMID:11555651 doi:https://dx.doi.org/10.1074/jbc.M105961200
- ↑ Nair D, Kim Y, Myers LC. Mediator and TFIIH govern carboxyl-terminal domain-dependent transcription in yeast extracts. J Biol Chem. 2005 Oct 7;280(40):33739-48. Epub 2005 Aug 2. PMID:16076843 doi:https://dx.doi.org/M506067200
- ↑ Takagi Y, Kornberg RD. Mediator as a general transcription factor. J Biol Chem. 2006 Jan 6;281(1):80-9. Epub 2005 Nov 1. PMID:16263706 doi:https://dx.doi.org/M508253200
- ↑ Takagi Y, Calero G, Komori H, Brown JA, Ehrensberger AH, Hudmon A, Asturias F, Kornberg RD. Head module control of mediator interactions. Mol Cell. 2006 Aug 4;23(3):355-64. PMID:16885025 doi:https://dx.doi.org/S1097-2765(06)00412-6