Cited by 94Heat shock proteins researchAdvanced Proteomics Techniques and ApplicationsUbiquitin and proteasome pathways

Systematic Identification of the HSP90 Regulated Proteome

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Wu, Zhixiang, Moghaddas Gholami, Amin, Kuster, Bernhard·2012·Molecular & Cellular Proteomics

Abstract

HSP90 is a central player in the folding and maturation of many proteins. More than two hundred HSP90 clients have been identified by classical biochemical techniques including important signaling proteins with high relevance to human cancer pathways. HSP90 inhibition has thus become an attractive therapeutic concept and multiple molecules are currently in clinical trials. It is therefore of fundamental biological and medical importance to identify, ideally, all HSP90 clients and HSP90 regulated proteins. To this end, we have taken a global and a chemical proteomic approach in geldanamycin treated cancer cell lines using stable isotope labeling with amino acids in cell culture and quantitative mass spectrometry. We identified >6200 proteins in four different human cell lines and ~1600 proteins showed significant regulation upon drug treatment. Gene ontology and pathway/network analysis revealed common and cell-type specific regulatory effects with strong connections to unfolded protein binding and protein kinase activity. Of the 288 identified protein kinases, 98 were geldanamycin treatment including >50 kinases not formerly known to be regulated by HSP90. Protein turn-over measurements using pulsed stable isotope labeling with amino acids in cell culture showed that protein down-regulation by HSP90 inhibition correlates with protein half-life in many cases. Protein kinases show significantly shorter half lives than other proteins highlighting both challenges and opportunities for HSP90 inhibition in cancer therapy. The proteomic responses of the HSP90 drugs geldanamycin and PU-H71 were highly similar suggesting that both drugs work by similar molecular mechanisms. Using HSP90 immunoprecipitation, we validated several kinases (AXL, DDR1, TRIO) and other signaling proteins (BIRC6, ISG15, FLII), as novel clients of HSP90. Taken together, our study broadly defines the cellular proteome response to HSP90 inhibition and provides a rich resource for further investigation relevant for the treatment of cancer.

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Crossref · 10.1074/mcp.m111.016675

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  • The fungal Hsp90 interactome includes numerous client proteins such as receptors, protein kinases and transcription factors.

    “The fungal Hsp90 interactome, which includes numerous client proteins such as receptors, protein kinases and transcription factors, displays a surprisingly high degree of plasticity that depends on environmental conditions.”
  • Many features of the Hsp90 interactome are highly conserved from yeast to humans despite substantial network rewiring over evolutionary time.

    “Also, many features of the Hsp90 interactome are highly conserved from yeast to humans despite substantial network rewiring over evolutionary time.”
  • Conserved features of the Hsp90 interactome include a preponderance of protein kinases and transcription factors as client proteins.

    “These conserved features include a preponderance of protein kinases and transcription factors as client proteins67,78,91-93.”

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Authors
Wu, Z., Moghaddas Gholami, A., & Kuster, B.
Affiliations
Technical University of Munich (DE)
Venue
Molecular & Cellular Proteomics
Publisher
Elsevier BV
Published
2012-06
Volume
11
Issue
6
Pages
M111.016675
ISSN
1535-9476 (ISSN-L)
OpenAlex
W2159443208
Cited by
94
References
53
Citations by year
2026: 3 · 2025: 2 · 2024: 2 · 2023: 3 · 2022: 1 · 2021: 7 · 2020: 4 · 2019: 7 · 2018: 6 · 2017: 6 · 2016: 7 · 2015: 10 · 2014: 18 · 2013: 14 · 2012: 4
FWCI
5.92
Type
journal article
Language
en
Open access
Locations
  • Molecular & Cellular Proteomics (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • mediaTUM (Technical University of Munich) (submittedVersion, other-oa)
Funders
China Scholarship Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
HSP90, HSP90 inhibition, geldanamycin, PU-H71, protein kinases, protein half-life, protein turnover, cancer cell lines, chemoproteomics, AXL, DDR1, trios, BIRC6, ISG15, FliI, drug target identification
MeSH terms
Half-Life, Humans, Kinetics, Protein Kinases, Purines, Signal Transduction, Benzoquinones, HSP90 Heat-Shock Proteins, Proteome, Protein Interaction Mapping, Cell Line, Tumor, Lactams, Macrocyclic, Benzodioxoles, Protein Stability, Protein Interaction Maps

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