Cited by 172Heat shock proteins researchFungal and yeast genetics researchUbiquitin and proteasome pathways

A two-hybrid screen of the yeast proteome for Hsp90 interactors uncovers a novel Hsp90 chaperone requirement in the activity of a stress-activated mitogen-activated protein kinase, Slt2p (Mpk1p).

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Millson, Stefan H., Truman, Andrew W., King, Victoria, Prodromou, Chrisostomos, Pearl, Laurence H., Piper, Peter W.·2005·Eukaryotic Cell

Abstract

The Hsp90 chaperone cycle catalyzes the final activation step of several important eukaryotic proteins (Hsp90 "clients"). Although largely a functional form of Hsp90, an Hsp90-Gal4p DNA binding domain fusion (Hsp90-BD) displays no strong interactions in the yeast two-hybrid system, consistent with a general transience of most Hsp90-client associations. Strong in vivo interactions are though detected when the E33A mutation is introduced into this bait, a mutation that should arrest Hsp90-client complexes at a stage where the client is stabilized, yet prevented from attaining its active form. This E33A mutation stabilized the two-hybrid interactions of the Hsp90-BD fusion with approximately 3% of the Saccharomyces cerevisiae proteome in a screen of the 6,000 yeast proteins expressed as fusions to the Gal4p activation domain (AD). Among the detected interactors were the two stress-activated mitogen-activated protein (MAP) kinases of yeast, Hog1p and Slt2p (Mpk1p). Column retention experiments using wild-type and mutant forms of Hsp90 and Slt2p MAP kinase, as well as quantitative measurements of the effects of stress on the two-hybrid interaction of mutant Hsp90-BD and AD-Slt2p fusions, revealed that Hsp90 binds exclusively to the dually Thr/Tyr-phosphorylated, stress-activated form of Slt2p [(Y-P,T-P)Slt2p] and also to the MAP kinase domain within this (Y-P,T-P)Slt2p. Phenotypic analysis of a yeast mutant that expresses a mutant Hsp90 (T22Ihsp82) revealed that Hsp90 function is essential for this (Y-P,T-P)Slt2p to activate one of its downstream targets, the Rlm1p transcription factor. The interaction between Hsp90 and (Y-P,T-P)Slt2p, characterized in this study, is probably essential in this Hsp90 facilitation of the Rlm1p activation by Slt2p.

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Crossref · 10.1128/ec.4.5.849-860.2005

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Authors
Millson, S. H., Truman, A. W., King, V., Prodromou, C., Pearl, L. H., & Piper, P. W.
Affiliations
  • University of Sheffield (GB)
  • Institute of Cancer Research (GB)
Corresponding author
Piper, Peter W.
Venue
Eukaryotic Cell
Published
2005-05
Volume
4
Issue
5
Pages
849-860
ISSN
  • 1535-9778 (ISSN-L)
  • 1535-9786
OpenAlex
W2138767066
Cited by
172
References
75
Citations by year
2026: 2 · 2025: 6 · 2024: 5 · 2023: 5 · 2022: 8 · 2021: 5 · 2020: 3 · 2019: 10 · 2018: 4 · 2017: 5 · 2016: 4 · 2015: 4 · 2014: 15 · 2013: 7 · 2012: 12
FWCI
4.89
Type
journal article
Language
en
Open access
Locations
  • Eukaryotic Cell (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Lincoln Repository (University of Lincoln) (acceptedVersion)
  • Figshare (submittedVersion, cc-by)
  • Sussex Research Online (University of Sussex) (submittedVersion)
Funders
Biotechnology and Biological Sciences Research Council (C506721/1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
Hsp90 chaperone, Hog1p, mitogen-activated protein kinase, protein-protein interaction, Hsp90 client proteins, Saccharomyces cerevisiae, Hsp82, chaperone cycle
MeSH terms
Caffeine, Mutation, Phosphorylation, Saccharomyces cerevisiae, HSP90 Heat-Shock Proteins, Proteome, Two-Hybrid System Techniques, Mitogen-Activated Protein Kinases, Saccharomyces cerevisiae Proteins

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