title: Structural basis for recruitment of CBP/p300 by hypoxia-inducible factor-1 alpha.
abstract: Adaptation to hypoxia is mediated by transactivation of hypoxia-responsive genes by hypoxia-inducible factor-1 (HIF-1) in complex with the CBP and p300 transcriptional coactivators. We report the solution structure of the cysteine/histidine-rich 1 (CH1) domain of p300 bound to the C-terminal transactivation domain of HIF-1 alpha. CH1 has a triangular geometry composed of four alpha-helices with three intervening Zn(2+)-coordinating centers. CH1 serves as a scaffold for folding of the HIF-1 alpha C-terminal transactivation domain, which forms a vise-like clamp on the CH1 domain that is stabilized by extensive hydrophobic and polar interactions. The structure reveals the mechanism of specific recognition of p300 by HIF-1 alpha, and shows how HIF-1 alpha transactivation is regulated by asparagine hydroxylation.
authors.affiliation: Division of Hematology/Oncology, Beth Israel Deaconess Medical Center, 330 Brookline Avenue, Boston, MA 02215, USA.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Freedman
authors.forename: Zhen-Yu J
authors.initials: ZY
authors.lastname: Sun
authors.forename: Florence
authors.initials: F
authors.lastname: Poy
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Kung
authors.forename: David M
authors.initials: DM
authors.lastname: Livingston
authors.forename: Gerhard
authors.initials: G
authors.lastname: Wagner
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Eck
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001216:Asparagine / Q000737:chemistry; D004926:Escherichia coli / Q000378:metabolism; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000737:chemistry*; D011485:Protein Binding; D011487:Protein Conformation; D017510:Protein Folding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D015534:Trans-Activators / Q000737:chemistry*; D014157:Transcription Factors / Q000737:chemistry* / Q000378:metabolism; D015533:Transcriptional Activation; D015032:Zinc / Q000737:chemistry
chemical_list: C497442:HIF1A protein, human; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D009687:Nuclear Proteins; D015534:Trans-Activators; D014157:Transcription Factors; D001216:Asparagine; D015032:Zinc