title: Yra1p, a conserved nuclear RNA-binding protein, interacts directly with Mex67p and is required for mRNA export.
abstract: Mex67p and Mtr2p constitute an essential mRNA export complex that interacts with poly(A)+ RNA and nuclear pore proteins. We have identified Yra1p, an intranuclear protein with in vitro RNA-RNA annealing activity, which directly binds to Mex67p. The complex between Yra1p and Mex67p was reconstituted in vitro and shown by UV-crosslinking to bind directly to RNA. Mutants of YRA1 are impaired in nuclear poly(A)+ RNA export at restrictive growth conditions. ALY, the mouse homologue of Yra1p and a transcriptional coactivator, can bind in vitro to yeast and human Mex67p and partly complements the otherwise non-viable yra1 null mutant. Thus, Yra1p is the first RNA-binding protein characterized, which bridges the shuttling Mex67p/Mtr2p exporter to intranuclear mRNA transport cargoes.
authors.affiliation: BZH, Biochemie-Zentrum Heidelberg, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Strässer
authors.forename: E
authors.initials: E
authors.lastname: Hurt
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001692:Biological Transport; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D051379:Mice; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D029543:Nucleocytoplasmic Transport Proteins; D011061:Poly A / Q000235:genetics; D011485:Protein Binding; D012333:RNA, Messenger / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000378:metabolism; D015003:Yeasts / Q000235:genetics
chemical_list: C105242:ALYREF protein, human; D005656:Fungal Proteins; C106898:MEX67 protein, S cerevisiae; D009687:Nuclear Proteins; D029543:Nucleocytoplasmic Transport Proteins; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; C486334:Refbp1 protein, mouse; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; C105887:YRA1 protein, S cerevisiae; D011061:Poly A