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rdf:type |
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lifeskim:mentions |
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pubmed:issue |
1
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pubmed:dateCreated |
2003-1-31
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pubmed:abstractText |
The androgen receptor (AR) is a member of the nuclear receptor superfamily that requires the action of molecular chaperones for folding and hormone binding. C-terminal Hsp-interacting protein (Chip) is a cochaperone that interacts with Hsp70 and Hsp90 molecular chaperones via a tetratricopeptide domain and inhibits chaperone-dependent protein folding in vitro. Chip also stimulates protein degradation by acting as an E3 ubiquitin ligase via a modified ring finger domain called a U box. We analyzed whether Chip affected AR levels using a transient transfection strategy. Chip overexpression led to a large decrease in AR steady state levels and increased levels of AR ubiquitinylation. However, Chip effects were not fully reversed by proteasome inhibitors, suggesting that mechanisms alternative to or in addition to proteasome-mediated degradation were involved. This hypothesis was supported by the finding that Chip overexpression reduced the rate of AR degradation, consistent with an effect on AR folding, perhaps leading to aggregation. The possibility that Chip affected AR folding was further supported by the finding that the effects of exogenous Chip were reproduced by a mutant lacking the U box. These results are discussed in terms of the role played by molecular chaperones in AR biogenesis.
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pubmed:grant |
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Acetylcysteine,
http://linkedlifedata.com/resource/pubmed/chemical/Benzoquinones,
http://linkedlifedata.com/resource/pubmed/chemical/Cysteine Endopeptidases,
http://linkedlifedata.com/resource/pubmed/chemical/Cysteine Proteinase Inhibitors,
http://linkedlifedata.com/resource/pubmed/chemical/Dihydrotestosterone,
http://linkedlifedata.com/resource/pubmed/chemical/HSP90 Heat-Shock Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/Lactams, Macrocyclic,
http://linkedlifedata.com/resource/pubmed/chemical/Leupeptins,
http://linkedlifedata.com/resource/pubmed/chemical/Ligases,
http://linkedlifedata.com/resource/pubmed/chemical/Molecular Chaperones,
http://linkedlifedata.com/resource/pubmed/chemical/Multienzyme Complexes,
http://linkedlifedata.com/resource/pubmed/chemical/Proteasome Endopeptidase Complex,
http://linkedlifedata.com/resource/pubmed/chemical/Quinones,
http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Androgen,
http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Estrogen,
http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Glucocorticoid,
http://linkedlifedata.com/resource/pubmed/chemical/STUB1 protein, human,
http://linkedlifedata.com/resource/pubmed/chemical/Ubiquitin,
http://linkedlifedata.com/resource/pubmed/chemical/Ubiquitin-Protein Ligases,
http://linkedlifedata.com/resource/pubmed/chemical/benzyloxycarbonylleucyl-leucyl-leuci...,
http://linkedlifedata.com/resource/pubmed/chemical/geldanamycin,
http://linkedlifedata.com/resource/pubmed/chemical/lactacystin
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pubmed:status |
MEDLINE
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pubmed:month |
Feb
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pubmed:issn |
0003-9861
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pubmed:author |
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pubmed:issnType |
Print
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pubmed:day |
1
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pubmed:volume |
410
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
134-40
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pubmed:dateRevised |
2007-11-14
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pubmed:meshHeading |
pubmed-meshheading:12559985-Acetylcysteine,
pubmed-meshheading:12559985-Benzoquinones,
pubmed-meshheading:12559985-Cysteine Endopeptidases,
pubmed-meshheading:12559985-Cysteine Proteinase Inhibitors,
pubmed-meshheading:12559985-Dihydrotestosterone,
pubmed-meshheading:12559985-Gene Expression,
pubmed-meshheading:12559985-HSP90 Heat-Shock Proteins,
pubmed-meshheading:12559985-HeLa Cells,
pubmed-meshheading:12559985-Humans,
pubmed-meshheading:12559985-Lactams, Macrocyclic,
pubmed-meshheading:12559985-Leupeptins,
pubmed-meshheading:12559985-Ligases,
pubmed-meshheading:12559985-Male,
pubmed-meshheading:12559985-Molecular Chaperones,
pubmed-meshheading:12559985-Multienzyme Complexes,
pubmed-meshheading:12559985-Prostatic Neoplasms,
pubmed-meshheading:12559985-Proteasome Endopeptidase Complex,
pubmed-meshheading:12559985-Quinones,
pubmed-meshheading:12559985-Receptors, Androgen,
pubmed-meshheading:12559985-Receptors, Estrogen,
pubmed-meshheading:12559985-Receptors, Glucocorticoid,
pubmed-meshheading:12559985-Tumor Cells, Cultured,
pubmed-meshheading:12559985-Ubiquitin,
pubmed-meshheading:12559985-Ubiquitin-Protein Ligases
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pubmed:year |
2003
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pubmed:articleTitle |
C-terminal Hsp-interacting protein slows androgen receptor synthesis and reduces its rate of degradation.
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pubmed:affiliation |
Department of Medicine, Mount Sinai School of Medicine, Box 1232, One Gustave L. Levy Place, New York, NY 10029, USA. chris.cardozo@mssm.edu
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.,
Research Support, Non-U.S. Gov't
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