NDLI: Escherichia coli transcript cleavage factors GreA and GreB stimulate promoter escape and gene expression in vivo and in vitro.

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Escherichia coli transcript cleavage factors GreA and GreB stimulate promoter escape and gene expression in vivo and in vitro.

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Escherichia coli transcript cleavage factors GreA and GreB stimulate promoter escape and gene expression in vivo and in vitro.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hsu, L. M. Chamberlin, M. J. Vo, N. V.
Description	Author Affiliation: Hsu LM ( Program in Biochemistry, Mount Holyoke College, South Hadley, MA 01075, USA.);
Abstract	The process of RNA chain initiation by RNA polymerases plays a central role in the regulation of transcription. In this complex phase of transcription, short oligomers are synthesized and released from the enzyme-promoter complex in a reaction termed abortive initiation. The polymerase undergoes many cycles of abortive initiation prior to completion of the initiation process, which is signaled by the translocation of the enzyme away from the promoter, release of sigma factor, and formation of an elongation complex in which the RNA is stably bound. We have studied the parameters that affect escape from the promoter by Escherichia coli RNA polymerase for the phage T7 A1 promoter, the phage T5 N25 promoter, and the chimeric promoter T5 N25antiDSR. The latter site contains a synthetic initial transcribed region that reduces its ability to synthesize RNA both in vivo and in vitro. Clearance from T5 N25antiDSR can be stimulated up to 10-fold in vitro by addition of the E. coli transcript cleavage factor GreA or GreB, but these factors have little effect on transcription from the normal T7 A1 or T5 N25 promoters. Using an E. coli strain lacking GreA and GreB, we were also able to show stimulation of transcription by the Gre factors from the T5 N25antiDSR promotor in vivo. The stimulation of RNA chain initiation by Gre factors, together with their known biochemical properties in the transcription elongation reaction, suggests some specific models for steps in the transcription initiation reaction.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	25
Volume Number	92
Language	English
Publisher	National Academy of Sciences
Publisher Date	1995-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Escherichia Coli Proteins Escherichia Coli Genetics Gene Expression Regulation, Bacterial Peptide Elongation Factors Metabolism Transcription Factors Transcription, Genetic DNA-Directed RNA Polymerases Models, Genetic Molecular Sequence Data Promoter Regions, Genetic RNA Processing, Post-Transcriptional RNA, Bacterial Biosynthesis RNA, Messenger T-Phages Transcriptional Elongation Factors Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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