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Exploring Regioisomeric Indole-Furanone Tubulin Inhibitors.

Marcella Venettozzi1, Taylor E Coburn2, Blake A Evans2

  • 1Department of Biology, Hobart and William Smith Colleges, Geneva, New York 14456, United States.

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|October 6, 2025
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Summary
This summary is machine-generated.

Researchers developed novel antitubulin compounds targeting cancer by modifying a lead indole-furanone structure. Key modifications improved potency and provided insights into binding interactions within the tubulin colchicine site.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Tubulin is crucial for microtubule functions, including cell division and migration.
  • Tubulin inhibitors are promising cancer treatment targets.
  • A novel antitubulin motif combining furanone, indole, and dimethoxyphenyl rings was previously identified.

Purpose of the Study:

  • To synthesize and evaluate analogs of a lead indole-furanone compound (3) for enhanced antitubulin activity.
  • To elucidate structure-activity relationships and binding interactions in the tubulin colchicine binding site using molecular modeling.

Main Methods:

  • Synthesis of a library of 18 indole-furanone analogs.
  • Biological activity assessment against cancer cells (HL-60).
  • Molecular modeling to analyze binding interactions within the tubulin colchicine site.

Main Results:

  • Six synthesized compounds exhibited biological activity, with two showing submicromolar potency.
  • Structural analysis revealed that dimethoxy/trimethoxy substitution on the phenyl A-ring, N-indole substitution, and furanone C-ring orientation impact potency.
  • Optimal activity was associated with dimethoxyphenyl A-rings oriented toward the tubulin α-subunit and a furanone carbonyl group positioned cis to the A-ring.

Conclusions:

  • The study successfully advanced the development of novel antitubulin compounds with potential anticancer applications.
  • Specific structural modifications, particularly the orientation of the furanone carbonyl and phenyl A-ring, are critical for optimizing inhibitory activity.
  • Findings provide valuable insights for the rational design of future tubulin inhibitors targeting the colchicine binding site.