title: Enhanced cell-free transcription of the ribosomal protein L32 gene by the polyoma virus enhancer PEA3 DNA-binding protein.
abstract: The mouse-ribosomal-protein-L32-gene promoter contains a 12-bp sequence motif within the 5'-upstream region termed the beta element which shows significant similarity with the consensus sequence of the polyoma-virus-enhancer PEA3. A cloned PEA3 DNA-binding protein, expressed in Escherichia coli and purified, activates the expression of the ribosomal-protein-L32 gene in a cell-free system. Moreover, the PEA3 protein participates in the formation of the ribosomal-protein-L32-promoter-preinitiation-transcription complex. The preinitiation complex formed with PEA3 is resistant to competition by oligonucleotides containing the beta element. In addition anti-PEA3 serum interacts with a factor in mouse L1210 nuclear extract that binds to the beta element, causing a supershift in a mobility-shift assay. Our study demonstrates for the first time that the PEA3 protein can transactivate a cellular gene in a cell-free transcription system.
authors.affiliation: College of Biological Science, University of Guelph, Ontario, Canada.
authors.forename: T
authors.initials: T
authors.lastname: Yoganathan
authors.forename: A
authors.initials: A
authors.lastname: Cowie
authors.forename: J A
authors.initials: JA
authors.lastname: Hassell
authors.forename: B H
authors.initials: BH
authors.lastname: Sells
mesh_terms: D000818:Animals; D001483:Base Sequence; D002467:Cell Nucleus / Q000378:metabolism*; D002474:Cell-Free System; D003001:Cloning, Molecular; D007939:Leukemia L1210 / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000378:metabolism; D009838:Oligodeoxyribonucleotides; D010957:Plasmids; D011120:Polyomavirus / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000378:metabolism; D012269:Ribosomal Proteins / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D014407:Tumor Cells, Cultured
chemical_list: D009687:Nuclear Proteins; D009838:Oligodeoxyribonucleotides; D011994:Recombinant Proteins; D012269:Ribosomal Proteins; D014157:Transcription Factors; C041806:ribosomal protein L32; C065788:transcription factor PEA3