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Cell-Impermeable Hsp90α-Selective Inhibitor NDNA4 Inhibits Cancer Cell Migration and Targets Extracellular Hsp90α's

Tyelor S Reynolds1, Ian Mersich1, Brian S J Blagg1

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A novel inhibitor, NDNA4, targets extracellular heat shock protein 90 alpha (eHsp90α) and its F-5 fragment, revealing a new binding site. This discovery offers potential for new cancer drug development targeting metastasis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Heat shock protein 90 alpha (Hsp90α) is a chaperone protein with intracellular and extracellular functions.
  • Extracellular Hsp90α (eHsp90α) influences cell motility, inflammation, and wound healing.
  • The F-5 fragment of eHsp90α is crucial for its biological activity, including cell migration.

Purpose of the Study:

  • To investigate the interaction between the Hsp90α inhibitor NDNA4 and the F-5 fragment.
  • To identify potential new binding sites for therapeutic intervention in cancer.
  • To explore the role of eHsp90α in cancer progression and metastasis.

Main Methods:

  • Development of NDNA4, a cell-impermeable Hsp90α inhibitor.
  • Synthesis of NDNA Biotin for pull-down assays.
  • Circular dichroism and surface plasmon resonance (SPR) to analyze binding kinetics and conformational changes.

Main Results:

  • NDNA4 inhibited cancer cell invasion and eHsp90α-activated signaling pathways.
  • NDNA4 demonstrated binding to the F-5 fragment, indicating an interaction beyond the N-terminal ATP-binding site.
  • NDNA4 binding induced a conformational change in F-5, with a KD of 2.66 ± 1.36 μM.

Conclusions:

  • A previously unrecognized binding site for NDNA4 on eHsp90α's F-5 fragment exists.
  • This interaction suggests a new therapeutic target for inhibiting eHsp90α in cancer.
  • Small-molecule inhibitors targeting eHsp90α offer a promising avenue for cancer drug discovery, particularly for metastasis.