HuR binds to a single site on the C/EBPbeta mRNA of 3T3-L1 adipocytes.
HuR is a ligand for nuclear mRNAs containing adenylate-uridylate rich elements in the 3'-untranslated region. Once bound to the mRNA, HuR is recognized by adapter proteins which then facilitate nuclear export of the complex. In the cytosol HuR is thought to function to control stability and translation of its ligand message. In the 3T3-L1 cells HuR is constitutively expressed and localized predominantly to the nucleus in the preadipocytes. However within 30 min of exposure to the differentiation stimulus, the HuR content in the cytosol increases consistent with HuR regulating the availability of relevant mRNAs for translation. Using in vitro RNA gel shifts, we have demonstrated that the C/EBPbeta message is a ligand for HuR and that the single binding site is an adenylate-uridylate rich element in the 3'-untranslated region.
Jones
Heath
H
Department of Biochemistry and Molecular Biology, The Brody School of Medicine at East Carolina University, Greenville, NC 27858, USA.
Carver
Melinda
M
Pekala
Phillip H
PH
D016475:3T3 Cells; D020121:5' Untranslated Regions / Q000235:genetics; D017667:Adipocytes / Q000166:cytology / Q000378:metabolism*; D000818:Animals; D000954:Antigens, Surface / Q000378:metabolism*; D001665:Binding Sites; D022782:CCAAT-Enhancer-Binding Protein-beta / Q000235:genetics* / Q000378:metabolism; D002454:Cell Differentiation; D002467:Cell Nucleus / Q000378:metabolism; D003600:Cytosol / Q000378:metabolism; D017931:DNA Primers; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; D008024:Ligands; D051379:Mice; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism
D020121:5' Untranslated Regions; D000954:Antigens, Surface; D022782:CCAAT-Enhancer-Binding Protein-beta; D017931:DNA Primers; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; C098770:ELAVL1 protein, human; D008024:Ligands; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D011994:Recombinant Proteins