title: The extracellular signal-regulated protein kinases Erk1/Erk2 stimulate expression and biological activity of the transcriptional regulator Egr-1.
abstract: The zinc finger protein early growth response 1 (Egr-1) is a transcriptional activator involved in the regulation of growth and differentiation. We show here that a constitutive active mutant of mitogen-activated kinase kinase-1 (MAPKK-1) strongly stimulates the activity of the Egr-1 promoter, thus explaining the effects of mitogens upon Egr-1 mRNA and protein levels. Moreover, we show that a constitutive active MAPKK-1 leads to an increase in the biological activity of Egr-1 to activate transcription. We conclude that the signaling pathway involving mitogen-activated protein kinase/extracellular signal-regulated protein kinase has a dual impact on the biology of Egr-1 by controlling the transcription of the Egr-1 gene and the transcriptional activity of the Egr-1 protein.
authors.affiliation: Department of Medical Biochemistry and Molecular Biology, University of Saarland Medical Center, Homburg, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Kaufmann
authors.forename: K
authors.initials: K
authors.lastname: Bach
authors.forename: G
authors.initials: G
authors.lastname: Thiel
mesh_terms: D004268:DNA-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics; D051766:Early Growth Response Protein 1; D005786:Gene Expression Regulation; D006801:Humans; D017874:Immediate-Early Proteins; D008156:Luciferases / Q000378:metabolism; D048369:MAP Kinase Kinase 1; D020935:MAP Kinase Signaling System; D019950:Mitogen-Activated Protein Kinase 1 / Q000235:genetics / Q000502:physiology; D048052:Mitogen-Activated Protein Kinase 3; D020929:Mitogen-Activated Protein Kinase Kinases / Q000235:genetics / Q000502:physiology; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000502:physiology*; D016297:Mutagenesis, Site-Directed; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000502:physiology; D014157:Transcription Factors / Q000096:biosynthesis* / Q000235:genetics; D014162:Transfection; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; C497325:EGR1 protein, human; D051766:Early Growth Response Protein 1; D017874:Immediate-Early Proteins; D014157:Transcription Factors; D008156:Luciferases; D017346:Protein Serine-Threonine Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D048369:MAP Kinase Kinase 1; C482125:MAP2K1 protein, human; D020929:Mitogen-Activated Protein Kinase Kinases; D001616:beta-Galactosidase