title: YB-1 as a cell cycle-regulated transcription factor facilitating cyclin A and cyclin B1 gene expression.
abstract: Expression of the Y-box protein YB-1 is increased in proliferating normal and cancer cells, but its role in cell proliferation and cell cycle progression is unclear. We have identified a cell cycle-dependent relocalization of YB-1 from the cytoplasm to the nucleus at the G1/S phase transition and demonstrate that both the charged zipper and the cold shock domain are involved in regulating this process. Using cell lines that constitutively overexpress YB-1, we show that nuclear accumulation of YB-1 is associated with increased cyclin A and cyclin B1 mRNA and protein expression. We provide evidence that deregulated YB-1 expression is linked to adhesion-independent cell proliferation through the induction of cyclin A. Thus, we have identified YB-1 as a cell cycle stage-specific transcription factor important for cell proliferation.
authors.affiliation: Max-Delbrück-Centrum für Molekulare Medizin, Robert-Rössle-Strasse 10, 13092 Berlin, Germany. karsten.juerchott@charite.de
authors.forename: Karsten
authors.initials: K
authors.lastname: Jurchott
authors.forename: Stephan
authors.initials: S
authors.lastname: Bergmann
authors.forename: Ulrike
authors.initials: U
authors.lastname: Stein
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Walther
authors.forename: Martin
authors.initials: M
authors.lastname: Janz
authors.forename: Isabella
authors.initials: I
authors.lastname: Manni
authors.forename: Giulia
authors.initials: G
authors.lastname: Piaggio
authors.forename: Ellen
authors.initials: E
authors.lastname: Fietze
authors.forename: Manfred
authors.initials: M
authors.lastname: Dietel
authors.forename: Hans-Dieter
authors.initials: HD
authors.lastname: Royer
mesh_terms: D020816:Amino Acid Motifs; D001943:Breast Neoplasms / Q000378:metabolism; D022762:CCAAT-Enhancer-Binding Proteins / Q000378:metabolism / Q000502:physiology*; D002448:Cell Adhesion; D002453:Cell Cycle; D002455:Cell Division; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D002469:Cell Separation; D019925:Cyclin A / Q000235:genetics / Q000378:metabolism*; D019926:Cyclin B / Q000235:genetics / Q000378:metabolism*; D056744:Cyclin B1; D003593:Cytoplasm / Q000378:metabolism; D004268:DNA-Binding Proteins; D005434:Flow Cytometry; D016193:G1 Phase; D015972:Gene Expression Regulation, Neoplastic; D017930:Genes, Reporter; D006367:HeLa Cells; D006801:Humans; D015151:Immunoblotting; D007150:Immunohistochemistry; D007700:Kinetics; D008856:Microscopy, Fluorescence; D009154:Mutation; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D011401:Promoter Regions, Genetic; D017434:Protein Structure, Tertiary; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016196:S Phase; D013347:Subcellular Fractions / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism*; D014162:Transfection; D051840:Y-Box-Binding Protein 1
chemical_list: D022762:CCAAT-Enhancer-Binding Proteins; C534699:CCNB1 protein, human; D019925:Cyclin A; D019926:Cyclin B; D056744:Cyclin B1; D004268:DNA-Binding Proteins; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D012333:RNA, Messenger; D014157:Transcription Factors; D051840:Y-Box-Binding Protein 1; C070856:YBX1 protein, human