Mediator: Difference between revisions
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Mediator itself is a large complex consisting of approximately 22 [[ | Mediator itself is a large complex consisting of approximately 22 [[Polypeptides|polypeptides]]. This large structure is formed from 3 domains: the head, middle and tail which as unit can either exist on its own or associated with [[RNA polymerase II|RNA polymerase II]] via the c-terminal domain. | ||
=== Function === | === Function === | ||
The main function of the mediator complex is to interact with activators. These mediator-activator interactions, along with other transcription factors, aid the recruitment and assembly of the pre-initiation complex (PIC)<ref>Poss Z., Ebmeier C., Taatjes D. (2013) Critical Views in Biochemistry and Molecular Biology, Volume 38, Page 575-608.</ref>. | The main function of the mediator complex is to interact with upstream activators on the mRNA, as well as with RNA Polymerase II to initiate [[Transcription|transcription]]. Activators cannot activate transcription independently ''[[In_vitro|In vitro]], ''and so the mediator complex is believed to aid the initiation of transcription via interactions with activators at certain locations on the mediator complex. These mediator-activator interactions, along with other transcription factors, aid the recruitment and assembly of the pre-initiation complex (PIC)<ref>Poss Z., Ebmeier C., Taatjes D. (2013) Critical Views in Biochemistry and Molecular Biology, Volume 38, Page 575-608.</ref>. | ||
=== | === Discovery of Mediator<br> === | ||
Mediator was first wrote about in a 1990 paper by Kelleher, Flanagan and Kornberg titled 'A novel mediator between activator proteins and the RNA polymerase II transcription apparatus'<ref name="Original 1990 paper by Kelleher, Flanagan and Kornberg">https://www.sciencedirect.com/science/article/pii/0092867490906858?via%3Dihub</ref>. They found a gene activator protein in yeast which aided ''In vitro'' transcription of the genetic material. This research led to a Nobel Prize in Chemistry for Kornberg in 2006<ref name="Kornberg's Nobel Prize announcement page">https://www.nobelprize.org/prizes/chemistry/2006/prize-announcement/</ref>. | |||
=== References<br> === | |||
<references /> | <references /> | ||
Latest revision as of 19:10, 15 November 2018
Mediator itself is a large complex consisting of approximately 22 polypeptides. This large structure is formed from 3 domains: the head, middle and tail which as unit can either exist on its own or associated with RNA polymerase II via the c-terminal domain.
Function
The main function of the mediator complex is to interact with upstream activators on the mRNA, as well as with RNA Polymerase II to initiate transcription. Activators cannot activate transcription independently In vitro, and so the mediator complex is believed to aid the initiation of transcription via interactions with activators at certain locations on the mediator complex. These mediator-activator interactions, along with other transcription factors, aid the recruitment and assembly of the pre-initiation complex (PIC)[1].
Discovery of Mediator
Mediator was first wrote about in a 1990 paper by Kelleher, Flanagan and Kornberg titled 'A novel mediator between activator proteins and the RNA polymerase II transcription apparatus'[2]. They found a gene activator protein in yeast which aided In vitro transcription of the genetic material. This research led to a Nobel Prize in Chemistry for Kornberg in 2006[3].
References
- ↑ Poss Z., Ebmeier C., Taatjes D. (2013) Critical Views in Biochemistry and Molecular Biology, Volume 38, Page 575-608.
- ↑ https://www.sciencedirect.com/science/article/pii/0092867490906858?via%3Dihub
- ↑ https://www.nobelprize.org/prizes/chemistry/2006/prize-announcement/