Genetic and Biochemical Analysis of p23 and Ansamycin Antibiotics in the Function of Hsp90-Dependent Signaling Proteins
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The ubiquitous molecular chaperone Hsp90 acts in concert with a cohort of associated proteins to facilitate the functional maturation of a number of cellular signaling proteins, such as steroid hormone receptors and oncogene tyrosine kinases. The Hsp90-associated protein p23 is required for the assembly of functional steroid aporeceptor complexes in cell lysates, and Hsp90-binding ansamycin antibiotics disrupt the activity of Hsp90-dependent signaling proteins in cultured mammalian cells and prevent the association of p23 with Hsp90-receptor heterocomplexes; these observations have led to the hypotheses that p23 is required for the maturation of Hsp90 target proteins and that ansamycin antibiotics abrogate the activity of such proteins by disrupting the interaction of p23 with Hsp90. In this study, I demonstrate that ansamycin antibiotics disrupt the function of Hsp90 target proteins expressed in yeast cells; prevent the assembly of Sba1, a yeast p23-like protein, into steroid receptor-Hsp90 complexes; and result in the assembly of receptor-Hsp90 complexes that are defective for ligand binding. To assess the role of p23 in Hsp90 target protein function, I show that the activity of Hsp90 target proteins is unaffected by deletion of SBA1. Interestingly, steroid receptor activity in cells lacking Sba1 displays increased sensitivity to ansamycin antibiotics, and this phenotype is rescued by the expression of human p23 in yeast cells. These findings indicate that Hsp90-dependent signaling proteins can achieve a functional conformation in vivo in the absence of p23. Furthermore, while the presence of p23 decreases the sensitivity of Hsp90-dependent processes to ansamycin treatment, ansamycin antibiotics disrupt signaling through some mechanism other than altering the Hsp90-p23 interaction.
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p23 can substitute for Sba1 in yeast GR transactivation assays.
“given that p23 can substitute for Sba1 in yeast GR transactivation assays32,33.”
From Structure of Hsp90–p23–GR reveals the Hsp90 client-remodelling mechanism (2022) · cites this paper as [33]
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- Authors
- Bohen, S. P.
- Affiliations
- National Institutes of Health (US)
- Corresponding author
- Bohen, Sean P.
- Venue
- Molecular and Cellular Biology
- Publisher
- Informa UK Limited
- Published
- 1998-06
- Volume
- 18
- Issue
- 6
- Pages
- 3330-3339
- ISSN
- 0270-7306 (ISSN-L)
- 1098-5549
- PMC
- PMC108914
- OpenAlex
- W1827557434
- Cited by
- 106
- References
- 70
- Citations by year
- 2024: 1 · 2023: 2 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 3
- FWCI
- 3.72
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Molecular and Cellular Biology (publishedVersion)
- PubMed Central (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute for Health and Care Research
- National Institutes of Health
- National Cancer Institute
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
- Keywords
- HSP90, p23, ansamycin antibiotics, steroid hormone receptors, molecular chaperones, ligand binding, protein maturation
- MeSH terms
- Amino Acid Sequence, Anti-Bacterial Agents, Antibiotics, Antineoplastic, DNA-Binding Proteins, Humans, Molecular Sequence Data, Phenotype, Protein-Tyrosine Kinases, Quinones, Receptors, Steroid, Saccharomyces cerevisiae, Signal Transduction, Oncogene Protein pp60(v-src), Benzoquinones, Sequence Alignment, HSP90 Heat-Shock Proteins, Lactams, Macrocyclic
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