Diazonamide A and a synthetic structural analog: Disruptive effects on mitosis and cellular microtubules and analysis of their interactions with tubulin

Zobeida Cruz-Monserrate, Hélène C. Vervoort, Ruoli Bai, David J. Newman, Stephen B. Howell, Gerrit Los, Jeffrey T. Mullaney, Michael D. Williams, George Pettit, William Fenical, Ernest Hamel

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

The marine ascidian Diazona angulata was the source organism for the complex cytotoxic peptide diazonamide A. The molecular structure of this peptide was recently revised after synthesis of a biologically active analog of diazonamide A in which a single nitrogen atom was replaced by an oxygen atom. Diazonamide A causes cells to arrest in mitosis, and, after exposure to the drug, treated cells lose both interphase and spindle microtubules. Both diazonamide A and the oxygen analog are potent inhibitors of microtubule assembly, equivalent in activity to dolastatin 10 and therefore far more potent than dolastatin 15. This inhibition of microtubule assembly is accompanied by potent inhibition of tubulin-dependent GTP hydrolysis, also comparable with the effects observed with dolastatin 10. However, the remaining biochemical properties of diazonamide A and its analog differ markedly from those of dolastatin 10 and closely resemble the properties of dolastatin 15. Neither diazonamide A nor the analog inhibited the binding of [3H]vinblastine, [3H]dolastatin 10, or [8-14C]GTP to tubulin. Nor were they able to stabilize the colchicine binding activity of tubulin. These observations indicate either that diazonamide A and the analog have a unique binding site on tubulin differing from the vinca alkaloid and dolastatin 10 binding sites, or that diazonamide A and the analog bind weakly to unpolymerized tubulin but strongly to microtubule ends. If the latter is correct, diazonamide A and its oxygen analog should have uniquely potent inhibitory effects on the dynamic properties of microtubules.

Original languageEnglish (US)
Pages (from-to)1273-1280
Number of pages8
JournalMolecular Pharmacology
Volume63
Issue number6
DOIs
StatePublished - Jun 1 2003

Fingerprint

dolastatin 10
Tubulin
Mitosis
Microtubules
Oxygen
Guanosine Triphosphate
Binding Sites
Vinca Alkaloids
diazonamide A
Urochordata
Peptides
Vinblastine
Interphase
Colchicine
Molecular Structure
Hydrolysis
Nitrogen

ASJC Scopus subject areas

  • Pharmacology

Cite this

Diazonamide A and a synthetic structural analog : Disruptive effects on mitosis and cellular microtubules and analysis of their interactions with tubulin. / Cruz-Monserrate, Zobeida; Vervoort, Hélène C.; Bai, Ruoli; Newman, David J.; Howell, Stephen B.; Los, Gerrit; Mullaney, Jeffrey T.; Williams, Michael D.; Pettit, George; Fenical, William; Hamel, Ernest.

In: Molecular Pharmacology, Vol. 63, No. 6, 01.06.2003, p. 1273-1280.

Research output: Contribution to journalArticle

Cruz-Monserrate, Z, Vervoort, HC, Bai, R, Newman, DJ, Howell, SB, Los, G, Mullaney, JT, Williams, MD, Pettit, G, Fenical, W & Hamel, E 2003, 'Diazonamide A and a synthetic structural analog: Disruptive effects on mitosis and cellular microtubules and analysis of their interactions with tubulin', Molecular Pharmacology, vol. 63, no. 6, pp. 1273-1280. https://doi.org/10.1124/mol.63.6.1273
Cruz-Monserrate, Zobeida ; Vervoort, Hélène C. ; Bai, Ruoli ; Newman, David J. ; Howell, Stephen B. ; Los, Gerrit ; Mullaney, Jeffrey T. ; Williams, Michael D. ; Pettit, George ; Fenical, William ; Hamel, Ernest. / Diazonamide A and a synthetic structural analog : Disruptive effects on mitosis and cellular microtubules and analysis of their interactions with tubulin. In: Molecular Pharmacology. 2003 ; Vol. 63, No. 6. pp. 1273-1280.
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