title: A cyclophilin function in Hsp90-dependent signal transduction.
abstract: Cpr6 and Cpr7, the Saccharomyces cerevisiae homologs of cyclophilin-40 (CyP-40), were shown to form complexes with Hsp90, a protein chaperone that functions in several signal transduction pathways. Deletion of CPR7 caused severe growth defects when combined with mutations that decrease the amount of Hsp90 or Sti1, another component of the Hsp90 chaperone machinery. The activities of two heterologous Hsp90-dependent signal transducers expressed in yeast, glucocorticoid receptor and pp60(v-src) kinase, were adversely affected by cpr7 null mutations. These results suggest that CyP-40 cyclophilins play a general role in Hsp90-dependent signal transduction pathways under normal growth conditions.
authors.affiliation: Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, 2153 Sheridan Road, Evanston, IL 60208, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Duina
authors.forename: H C
authors.initials: HC
authors.lastname: Chang
authors.forename: J A
authors.initials: JA
authors.lastname: Marsh
authors.forename: S
authors.initials: S
authors.lastname: Lindquist
authors.forename: R F
authors.initials: RF
authors.lastname: Gaber
mesh_terms: D000591:Amino Acid Isomerases / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D000081406:Peptidyl-Prolyl Isomerase F; D021983:Cyclophilins; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D018841:HSP90 Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D009154:Mutation; D015688:Oncogene Protein pp60(v-src) / Q000378:metabolism; D019696:Peptidylprolyl Isomerase; D016392:Proto-Oncogene Proteins pp60(c-src) / Q000378:metabolism; D011965:Receptors, Glucocorticoid / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins; D015398:Signal Transduction; D000097322:Peptidyl-Prolyl Isomerase D
chemical_list: D000591:Amino Acid Isomerases; D002352:Carrier Proteins; D000081406:Peptidyl-Prolyl Isomerase F; D021983:Cyclophilins; D005656:Fungal Proteins; D018841:HSP90 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D015688:Oncogene Protein pp60(v-src); D019696:Peptidylprolyl Isomerase; D016392:Proto-Oncogene Proteins pp60(c-src); D011965:Receptors, Glucocorticoid; D029701:Saccharomyces cerevisiae Proteins; C000631444:CPR6 protein, S cerevisiae; D000097322:Peptidyl-Prolyl Isomerase D; C000631445:CPR7 protein, S cerevisiae; C542289:STI1 protein, S cerevisiae