Journal article
Control of formation of two distinct classes of RNA polymerase II elongation complexes
Molecular and cellular biology, Vol.12(5), pp.2078-2090
05/1992
DOI: 10.1128/mcb.12.5.2078-2090.1992
PMCID: PMC364379
PMID: 1569941
Abstract
We have examined elongation by RNA polymerase II initiated at a promoter and have identified two classes of elongation complexes. Following initiation at a promoter, all polymerase molecules enter an abortive mode of elongation. Abortive elongation is characterized by the rapid generation of short transcripts due to pausing of the polymerase followed by termination of transcription. Termination of the early elongation complexes can be suppressed by the addition of 250 mM KCl or 1 mg of heparin per ml soon after initiation. Elongation complexes of the second class carry out productive elongation in which long transcripts can be synthesized. Productive elongation complexes are derived from early paused elongation complexes by the action of a factor which we call P-TEF (positive transcription elongation factor). P-TEF is inhibited by 5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole at concentrations which have no effect on the initiation of transcription. By using templates immobilized on paramagnetic particles, we show that isolated preinitiation complexes lack P-TEF and give rise to transcription complexes which can carry out only abortive elongation. The ability to carry out productive elongation can be restored to isolated transcription complexes by the addition of P-TEF after initiation. A model is presented which describes the role of elongation factors in the formation and maintenance of elongation complexes. The model is consistent with the available in vivo data concerning control of elongation and is used to predict the outcome of other potential in vitro and in vivo experiments.
Details
- Title: Subtitle
- Control of formation of two distinct classes of RNA polymerase II elongation complexes
- Creators
- Nicholas F Marshall - Department of Biochemistry, University of Iowa, Iowa City 52242David H Price
- Resource Type
- Journal article
- Publication Details
- Molecular and cellular biology, Vol.12(5), pp.2078-2090
- Publisher
- United States
- DOI
- 10.1128/mcb.12.5.2078-2090.1992
- PMID
- 1569941
- PMCID
- PMC364379
- ISSN
- 0270-7306
- eISSN
- 1098-5549
- Grant note
- GM35500 / NIGMS NIH HHS DK25295 / NIDDK NIH HHS
- Language
- English
- Date published
- 05/1992
- Academic Unit
- Biochemistry and Molecular Biology
- Record Identifier
- 9984025298802771
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