Abstract

Analysis of premature termination in c-myc during transcription by RNA polymerase II in a HeLa nuclear extract. L London , R G Keene and R Landick Department of Biology, Washington University, St. Louis, Missouri 63130. ABSTRACT Transcriptional regulation of the human c-myc gene, an important aspect of cellular differentiation, occurs in part at the level of transcript elongation. In vivo, transcriptional arrest, due to either pausing or termination, occurs near the junction between the first exon and first intron and varies with the growth state of the cell. We have tested the transcription of c-myc templates in HeLa nuclear extracts. We did not observe significant arrest under standard conditions, but we found that a considerable fraction of transcription complexes stopped at the c-myc TII site (just past the first exon-intron junction) when the KCl concentration was raised to 400 mM during elongation. Transcriptional arrest at TII also was observed at KCl concentrations as low as 130 mM and when potassium acetate or potassium glutamate was substituted for KCl. Under these conditions, arrest occurred at the TII site when transcription was initiated at either the c-myc P2 promoter or the adenovirus 2 major late promoter. Further, the TII sequence itself, in forward but not reverse orientation, was sufficient to stop transcription in a HeLa nuclear extract. By separating the TII RNA from active transcription complexes by using gel filtration, we found that arrest at TII at 400 mM KCl resulted in transcript release and thus true transcriptional termination. The efficiency of termination at TII depended on the growth state of the cells from which the extracts were made, suggesting that some factor or factors control premature termination in c-myc. CiteULike Connotea Delicious Digg Facebook Google+ Mendeley Reddit StumbleUpon Twitter What's this? « Previous | Next Article » Table of Contents This Article doi: 10.1128/​MCB.11.9.4599 Mol. Cell. Biol. September 1991 vol. 11 no. 9 4599-4615 » Abstract PDF Classifications Research Article Services Email this article to a colleague Similar articles in ASM journals Alert me when this article is cited Alert me if a correction is posted Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of MCB Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Load citing article information Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by London, L. Articles by Landick, R. Search for related content PubMed PubMed citation Articles by London, L. Articles by Landick, R. Related Content Load related web page information Social Bookmarking CiteULike Connotea Delicious Digg Facebook Google+ Mendeley Reddit StumbleUpon Twitter What's this? current issue January 2012, volume 32, issue 1 Spotlights in the Current Issue Architecture of the Yeast RNA Polymerase II Open Complex State and Regulation by TFIIF GATA-1 Establishes Cell-Type-Specific Autophagy as a Developmental Program Prickle Phosphorylation Regulates Its Localization and β-Catenin-Independent Wnt Signaling Alert me to new issues of MCB About MCB Subscribers Authors Reviewers Advertisers Inquiries from the Press Permissions & Commercial Reprints ASM Journals Public Access Policy MCB RSS Feeds 1752 N Street N.W. • Washington DC 20036 202.737.3600 • 202.942.9355 fax • journals@asmusa.org Print ISSN: 0270-7306 Online ISSN: 1098-5549 Copyright © 2011 by the American Society for Microbiology. For an alternate route to MCB .asm.org, visit: http://intl- MCB .asm.org | More Info» var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); var pageTracker = _gat._getTracker("UA-5821458-11"); pageTracker._trackPageview();