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Cellular and Molecular Biology Letters

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

1Dipartimento di Biochimica e Biologia Molecolare, Università degli Studi di Parma, Viale G.P. Usberti 23/A, 43100, Parma, Italy

© 2007 University of Wrocław, Poland. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

Citation Information: Cellular and Molecular Biology Letters. Volume 13, Issue 1, Pages 112–118, ISSN (Online) 1689-1392, DOI: 10.2478/s11658-007-0041-y, October 2007

Publication History

Published Online:
2007-10-29

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.

Keywords: RNA polymerase III; Transcription reinitiation; TFIIIB; G-less cassette

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