title: An Oct4-centered protein interaction network in embryonic stem cells.
abstract: Transcription factors, such as Oct4, are critical for establishing and maintaining pluripotent cell identity. Whereas the genomic locations of several pluripotency transcription factors have been reported, the spectrum of their interaction partners is underexplored. Here, we use an improved affinity protocol to purify Oct4-interacting proteins from mouse embryonic stem cells (ESCs). Subsequent purification of Oct4 partners Sall4, Tcfcp2l1, Dax1, and Esrrb resulted in an Oct4 interactome of 166 proteins, including transcription factors and chromatin-modifying complexes with documented roles in self-renewal, but also many factors not previously associated with the ESC network. We find that Esrrb associated with the basal transcription machinery and also detect interactions between transcription factors and components of the TGF-beta, Notch, and Wnt signaling pathways. Acute depletion of Oct4 reduced binding of Tcfcp2l1, Dax1, and Esrrb to several target genes. In conclusion, our purification protocol allowed us to bring greater definition to the circuitry controlling pluripotent cell identity.
authors.affiliation: Department of Cell Biology, Erasmus MC, Dr. Molewaterplein 50, 3015GE Rotterdam, The Netherlands.
authors.forename: Debbie L C
authors.initials: DLC
authors.lastname: van den Berg
authors.affiliation: Department of Cell Biology, Erasmus MC, Dr. Molewaterplein 50, 3015GE Rotterdam, The Netherlands.
authors.forename: Tim
authors.initials: T
authors.lastname: Snoek
authors.affiliation: MRC Centre for Regenerative Medicine, Institute for Stem Cell Research, School of Biological Sciences, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh EH9 3JQ, UK.
authors.forename: Nick P
authors.initials: NP
authors.lastname: Mullin
authors.affiliation: MRC Centre for Regenerative Medicine, Institute for Stem Cell Research, School of Biological Sciences, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh EH9 3JQ, UK.
authors.forename: Adam
authors.initials: A
authors.lastname: Yates
authors.affiliation: Proteomics Center, Erasmus MC, Dr. Molewaterplein 50, 3015GE Rotterdam, The Netherlands.
authors.forename: Karel
authors.initials: K
authors.lastname: Bezstarosti
authors.affiliation: Proteomics Center, Erasmus MC, Dr. Molewaterplein 50, 3015GE Rotterdam, The Netherlands.
authors.forename: Jeroen
authors.initials: J
authors.lastname: Demmers
authors.affiliation: MRC Centre for Regenerative Medicine, Institute for Stem Cell Research, School of Biological Sciences, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh EH9 3JQ, UK.
authors.forename: Ian
authors.initials: I
authors.lastname: Chambers
authors.affiliation: Department of Cell Biology, Erasmus MC, Dr. Molewaterplein 50, 3015GE Rotterdam, The Netherlands. Electronic address: r.poot@erasmusmc.nl.
authors.forename: Raymond A
authors.initials: RA
authors.lastname: Poot
mesh_terms: D000818:Animals; D002460:Cell Line; D049109:Cell Proliferation; D053595:Embryonic Stem Cells / Q000166:cytology / Q000378:metabolism*; D018507:Gene Expression Regulation, Developmental; D053263:Gene Regulatory Networks / Q000235:genetics; D013058:Mass Spectrometry; D051379:Mice; D050814:Octamer Transcription Factor-3 / Q000378:metabolism*; D010641:Phenotype; D011485:Protein Binding; D021381:Protein Transport; D014157:Transcription Factors / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D050814:Octamer Transcription Factor-3; C494174:Pou5f1 protein, mouse; D014157:Transcription Factors