The transcription reinitiation properties of RNA polymerase III in the absence of transcription factors

Cell Mol Biol Lett. 2008;13(1):112-8. doi: 10.2478/s11658-007-0041-y. Epub 2007 Oct 29.

Abstract

Transcription reinitiation by RNA polymerase (Pol) III proceeds through facilitated recycling, a process by which the terminating Pol III, assisted by the transcription factors TFIIIB and TFIIIC, rapidly reloads onto the same transcription unit. To get further insight into the Pol III transcription mechanism, we analyzed the kinetics of transcription initiation and reinitiation of a simplified in vitro transcription system consisting only of Pol III and template DNA. The data indicates that, in the absence of transcription factors, first-round transcription initiation by Pol III proceeds at a normal rate, while facilitated reinitiation during subsequent cycles is compromised.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Gene Expression Regulation, Fungal / physiology
  • Molecular Sequence Data
  • RNA Polymerase III / physiology*
  • Saccharomyces cerevisiae / enzymology
  • Saccharomyces cerevisiae Proteins / genetics
  • Transcription Factor TFIIIB / deficiency*
  • Transcription Factor TFIIIB / physiology
  • Transcription Factor TFIIIC
  • Transcription Factors, TFIII / deficiency*
  • Transcription Factors, TFIII / physiology
  • Transcription, Genetic / physiology*

Substances

  • Saccharomyces cerevisiae Proteins
  • Transcription Factor TFIIIB
  • Transcription Factors, TFIII
  • Transcription Factor TFIIIC
  • RNA Polymerase III