Cited by 431Heat shock proteins researchProtein Structure and DynamicsUbiquitin and proteasome pathways

Atomic structure of Hsp90-Cdc37-Cdk4 reveals that Hsp90 traps and stabilizes an unfolded kinase

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Verba, Kliment A., Wang, Ray Yu-Ruei, Arakawa, Akihiko, Liu, Yanxin, Shirouzu, Mikako, Yokoyama, Shigeyuki, Agard, David A.·2016·Science

Published version of a preprint

Abstract

Holding kinases at the ready: About 60% of kinases only reach their active state in the presence of the molecular chaperone Hsp90 and its co-chaperone Cdc37. It is unclear how the chaperones facilitate kinase function or why only some kinases are chaperone-dependent. Verba et al. determined a 3.9 Å cryo–electron microscopy structure of Hsp90:Cdc37 in complex with the kinase Cdk4. Together, Hsp90 and Cdc37 trap the kinase in an open, partially unfolded state. Taking on this state probably has direct functional benefits. Science , this issue p. 1542

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Registry

Crossref · 10.1126/science.aaf5023

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  • The Hsp90 client-binding residues Y528, Q531 and M610 contact the unfolded Cdk4 client in the closed-state Hsp90:Cdc37:Cdk4 structure.

    “have been identified to contact the unfolded Cdk4 client in the Hsp90:Cdc37:Cdk4 closed state structure”

    From The structure of an Hsp90-immunophilin complex reveals cochaperone recognition of the client maturation state (2021) · cites this paper as Verba et al., 2016

    The sections on Hsp90’s closed conformation and the unfolded Cdk4 N-lobe describe a closed Hsp90:Cdc37:Cdk4 complex in which Cdk4 contacts an Hsp90 client-binding site. They do not identify Y528, Q531, or M610 as the contacting residues; searches for those residue labels found no matching passage in our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Cryo-EM structures of client-bound Hsp90 show the client unfolds substantially, probably when the closed state forms.

    “Cryo-EM structures of the client-bound Hsp90 reveal the client undergoes substantial unfolding, likely upon formation of the Hsp90 closed state”

    From The structure of an Hsp90-immunophilin complex reveals cochaperone recognition of the client maturation state (2021) · cites this paper as Verba et al., 2016

    The Abstract and the sections on Hsp90’s closed conformation and the Cdk4 N-lobe describe a cryo-EM complex in which Hsp90 is closed and the kinase is substantially unfolded. They do not establish that unfolding occurs when Hsp90 closes; the section on linking kinase unfolding to assembly instead proposes that kinases sample an open state that encourages chaperone binding. Page numbers are not available in our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • In previously reported closed-state structures the CTD is widened even without a bound H7e, suggesting NTD dimerization alone may cause this.

    “in existing closed state structures (Huck et al., 2017; Verba et al., 2016) the CTD adopts this widened conformation in the absence of a bound H7e moiety, indicating this may result from NTD dimerization alone”

    From The structure of an Hsp90-immunophilin complex reveals cochaperone recognition of the client maturation state (2021) · cites this paper as Verba et al., 2016

    The section “Hsp90 is in a closed conformation in the complex” (page unavailable) reports a closed Hsp90 structure with a small CTD rotation. The Main Text says that the NTDs dimerize in the closed state. Neither passage establishes that the CTD is widened without bound H7e or that NTD dimerization alone causes that conformation. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Both clients are threaded through the closed Hsp90 lumen, suggesting a universal binding mode for Hsp90 clients.

    “Both clients are threaded through the closed Hsp90 lumen, suggesting a universal binding mode for Hsp90 clients11,35”

    From Structure of Hsp90–p23–GR reveals the Hsp90 client-remodelling mechanism (2022) · cites this paper as [11]

    The section “The N-lobe of Cdk4 is significantly unfolded and threads through Hsp90” reports Cdk4 density passing through the Hsp90 lumen; “Hsp90 is in a closed conformation in the complex” establishes that Hsp90 is closed. This paper examines one client, Cdk4, and does not establish that both clients thread through the lumen or that this is a universal binding mode. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Two hydrophobic residues may represent the common binding pattern of the Hsp90 client: I271 and I274 in AhR, L525 and L528 in GR, and V89 and V92 in Cdk4.

    “we found that two hydrophobic residues may represent the common binding pattern of the Hsp90 client, which are I271 and I274 in AhR, L525 and L528 in GR,33 and V89 and V92 in Cdk428”

    From Cryo-EM structure of the cytosolic AhR complex. (2023) · cites this paper as [28]

    In “The N-lobe of Cdk4 is significantly unfolded and threads through Hsp90” (page unavailable), the paper reports hydrophobic interactions between Cdk4’s β5 strand and an Hsp90 client-binding site. It does not identify V89 and V92 as the interacting residues. In “Hsp90/Cdc37 capture and stabilize structural transitions within the kinase” (page unavailable), it proposes that kinase-client recognition depends on a propensity to unfold, rather than a specific binding sequence; the proposed common two-residue pattern is therefore not supported by this source. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Authors
Verba, K. A., Wang, R. Y.-R., Arakawa, A., Liu, Y., Shirouzu, M., Yokoyama, S., & Agard, D. A.
Affiliations
  • Howard Hughes Medical Institute (US)
  • RIKEN (JP)
Corresponding author
Agard, David A.
Venue
Science
Published
2016-06-24
Volume
352
Issue
6293
Pages
1542-1547
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2467034934
Cited by
424
References
58
Citations by year
2026: 25 · 2025: 23 · 2024: 35 · 2023: 44 · 2022: 53 · 2021: 52 · 2020: 52 · 2019: 52 · 2018: 40 · 2017: 39 · 2016: 7
FWCI
23.90
Type
journal article
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • Science (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Protein Structure Initiative-Biology (U01 GM098254)
  • American Association for Cancer Research-Breast Cancer Research Foundation (218084)
  • HHMI Helen Hay Whitney Foundation Fellowship
  • HHMI International Student Research Fellowship
  • HHMI
  • NIH National Institute of General Medical Sciences (P41 GM103310)
  • NSF (ACI-1053575)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
HSP90, Cdc37, CDK4, kinase activation, molecular chaperones, protein complex structure
MeSH terms
Animals, Enzyme Stability, Humans, Models, Molecular, Protein Structure, Secondary, Cell Cycle Proteins, Chaperonins, HSP90 Heat-Shock Proteins, Multiprotein Complexes, Cyclin-Dependent Kinase 4, Protein Unfolding, Sf9 Cells

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