title: Reconstitution of human hypoxia inducible factor HIF-1 in yeast: a simple in vivo system to identify and characterize HIF-1alpha effectors.
abstract: Hypoxia inducible factor 1 (HIF-1), the master regulator of hypoxia-activated genes, is involved in many diseases and is a valid drug target. In order to develop a simple and genetically tractable in vivo system for HIF-1 analysis, we tested the inducible expression of both human HIF-1 subunits (HIF-1alpha and ARNT) in the yeast Saccharomyces cerevisiae and showed the formation of transcriptionally active HIF-1. The use of this system for the identification and characterization of HIF-1 effectors was first validated by showing that two chemical Hsp90 inhibitors, geldanamycin and radicicol, impaired the activity of HIF-1 in yeast. By applying this system in mutant yeast strains, we then identified Hsp90 co-chaperones, which were required for HIF-1 activity. Furthermore, using yeast strains co-expressing truncated forms of HIF-1alpha with ARNT or both HIF-1alpha and ARNT, we characterized fragments of HIF-1alpha that acted as dominant negative mutants and suppressed HIF-1 activity.
authors.affiliation: Laboratory of Biochemistry, School of Medicine, University of Thessaly, 41222 Larissa, Greece.
authors.forename: Georgia G
authors.initials: GG
authors.lastname: Braliou
authors.forename: Emmanouil
authors.initials: E
authors.lastname: Venieris
authors.forename: Alkmini
authors.initials: A
authors.lastname: Kalousi
authors.forename: George
authors.initials: G
authors.lastname: Simos
mesh_terms: D051784:Aryl Hydrocarbon Receptor Nuclear Translocator / Q000378:metabolism; D018841:HSP90 Heat-Shock Proteins / Q000378:metabolism; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000235:genetics / Q000378:metabolism*; D018832:Molecular Chaperones / Q000378:metabolism; D021122:Protein Subunits; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic; D015003:Yeasts / Q000235:genetics
chemical_list: C497396:ARNT protein, human; C497442:HIF1A protein, human; D018841:HSP90 Heat-Shock Proteins; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D018832:Molecular Chaperones; D021122:Protein Subunits; D011994:Recombinant Proteins; D051784:Aryl Hydrocarbon Receptor Nuclear Translocator