Characterization of Two Taxol Photoaffinity Analogues Bearing Azide and Benzophenone-Related Photoreactive Substituents in the A-Ring Side Chain

Charles S. Swindell, Julia M. Heerding, Nancy E. Krauss, Susan Band Horwitz, Srinivasa Rao, Israel Ringel

Research output: Contribution to journalArticle

25 Scopus citations


Taxol is a structurally novel and clinically effective antitumor drug, which, unlike other antimitotic agents, induces the assembly of tubulin into microtubules. To characterize the binding site(s) of taxol on the microtubule, taxol-based photoaffinity reagents 1 and 2 bearing photoreactive groups on the A-ring side chain were prepared and evaluated. Taxol analogue 1 exhibits better microtubule assembly activity, greater cytotoxicity toward J774.2 cells, and more specific and efficient photolabeling of the β-subunit of tubulin than does analogue 2. Therefore, it would appear that 1 is the better candidate for further studies aimed at the characterization of the taxol binding site on the microtubule.

Original languageEnglish (US)
Pages (from-to)1446-1449
Number of pages4
JournalJournal of Medicinal Chemistry
Issue number10
Publication statusPublished - May 1 1994


ASJC Scopus subject areas

  • Molecular Medicine
  • Drug Discovery

Cite this