TFIIB-related Factors in RNA Polymerase I Transcription

Overview

Journal Biochim Biophys Acta

Specialties Biochemistry
Biophysics

Date 2012 Sep 11

PMID 22960599

Citations 22

Authors

Bruce A Knutson

Steven Hahn

Affiliations

Soon will be listed here.

Abstract

Eukaryotic RNA polymerases (Pol) I, II, III and archaeal Pol use a related set of general transcription factors to recognize promoter sequences and recruit Pol to promoters and to function at key points in the transcription initiation mechanism. The TFIIB-like general transcription factors (GTFs) function during several important and conserved steps in the initiation pathway for Pols II, III, and archaeal Pol. Until recently, the mechanism of Pol I initiation seemed unique, since it appeared to lack a GTF paralogous to the TFIIB-like proteins. The surprising recent discovery of TFIIB-related Pol I general factors in yeast and humans highlights the evolutionary conservation of transcription initiation mechanisms for all eukaryotic and archaeal Pols. These findings reveal new roles for the function of the Pol I GTFs and insight into the function of TFIIB-related factors. Models for Pol I transcription initiation are reexamined in light of these recent findings. This article is part of a Special Issue entitled: Transcription by Odd Pols.

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