Hormone-dependent transactivation by the human androgen receptor is regulated by a dnaJ protein.
Genetic studies were performed to examine the role of eukaryotic dnaJ protein, Ydj1p, in the regulated activation of human androgen receptor (hAR) after heterologous expression in Saccharomyces cerevisiae. Hormone-dependent activation of hAR was measured as a function of lacZ reporter gene expression, which was defective in ydj1-151 and ydj1-2 delta null mutant strains compared to the wild type. This defect was not due to receptor misfolding, since hAR in both wild type and mutant strains had a similar capacity to bind hormone. The target for Ydj1p action was determined to be the hAR hormone binding domain since an N-terminal fragment lacking this region was constitutively active in both wild type and ydj1-151 mutant strains. These data correlate hormone dependence of hAR activation with a requirement for Ydj1p function and are consistent with a role for dnaJ proteins in signal transduction by steroid hormone receptors.
Caplan
A J
AJ
Department of Cell Biology and Anatomy, Mount Sinai Medical Center, New York, New York 10029.
Langley
E
E
Wilson
E M
EM
Vidal
J
J
D001426:Bacterial Proteins / Q000378:metabolism; D001483:Base Sequence; D001665:Binding Sites; D003001:Cloning, Molecular; D017931:DNA Primers; D005656:Fungal Proteins / Q000378:metabolism*; D015870:Gene Expression; D050956:HSP40 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D007700:Kinetics; D015741:Metribolone / Q000378:metabolism* / Q000494:pharmacology; D008969:Molecular Sequence Data; D016296:Mutagenesis; D016133:Polymerase Chain Reaction; D011944:Receptors, Androgen / Q000096:biosynthesis / Q000378:metabolism*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D013045:Species Specificity; D015533:Transcriptional Activation; D001616:beta-Galactosidase / Q000096:biosynthesis
D001426:Bacterial Proteins; D017931:DNA Primers; D005656:Fungal Proteins; D050956:HSP40 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D011944:Receptors, Androgen; D011994:Recombinant Proteins; D029701:Saccharomyces cerevisiae Proteins; C070319:YDJ1 protein, S cerevisiae; D015741:Metribolone; D001616:beta-Galactosidase