Modulation of transcriptional activation of the proliferating cell nuclear antigen promoter by the adenovirus E1A 243-residue oncoprotein depends on proximal activators

Morris, G. F., Labrie, C., Mathews, M. B. (January 1994) Modulation of transcriptional activation of the proliferating cell nuclear antigen promoter by the adenovirus E1A 243-residue oncoprotein depends on proximal activators. Mol Cell Biol, 14 (1). pp. 543-53. ISSN 0270-7306 (Print)

URL: http://www.ncbi.nlm.nih.gov/pubmed/7903420
DOI: 10.1128/MCB.14.1.543

Abstract

Previous analyses defined a proliferating cell nuclear antigen (PCNA) E1A-responsive element (PERE) in the PCNA promoter that is essential for transactivation by the 243-residue product of the adenovirus type 2 E1A 12S mRNA (E1A 243R). In this report, we show that the PERE activates a heterologous basal promoter and confers susceptibility to transactivation by E1A 243R, indicating that the PERE is both necessary and sufficient for the response of the PCNA promoter to this oncoprotein. Insertion of linker sequences between the PERE and the site of transcription initiation in the PCNA promoter severely impairs the promoter's response to E1A 243R transactivation. GAL4 sites can replace the function of the PERE in the E1A 243R response of the PCNA basal promoter if transcriptional activators of suitable strength are supplied as GAL4 fusion proteins. Weak transcriptional activators render the PCNA basal promoter subject to transactivation by E1A 243R but do not endow the adenovirus E1B basal promoter with a similar response. Strong transcriptional activators do not support transactivation by E1A 243R, however; instead, E1A reduces the ability of the strong activators to activate both the PCNA and E1B basal promoters. Although other mechanistic differences might determine the response, the data imply a relationship between the activation strength of promoter-proximal effectors and the response of the PCNA basal promoter to E1A 243R. These experiments indicate that the PERE can function autonomously in mediating transactivation by E1A 243R and that the PCNA basal promoter is configured in a manner that permits modulation by E1A 243R of transcriptional activation by promoter-proximal effectors.

Item Type: Paper
Uncontrolled Keywords: Adenovirus E1A Proteins/ genetics Enhancer Elements (Genetics) Hela Cells Humans Nuclear Proteins/ genetics Proliferating Cell Nuclear Antigen Promoter Regions (Genetics) Recombinant Fusion Proteins/genetics Research Support, U.S. Gov't, P.H.S. Trans-Activation (Genetics) Trans-Activators/genetics Transcription Factor TFIID Transcription Factors/genetics Transfection
Subjects: organism description > virus > adenovirus
CSHL Authors:
Communities: CSHL labs
Depositing User: Matt Covey
Date: January 1994
Date Deposited: 26 Aug 2015 19:46
Last Modified: 26 Aug 2015 19:46
PMCID: PMC358404
Related URLs:
URI: http://repository.cshl.edu/id/eprint/31408

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