maytansine/vinca

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Natural products which interact with tubulin in the vinca domain: maytansine, rhizoxin, phomopsin A, dolastatins 10 and 15 and halichondrin B.

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Prijava / prijava

This paper summarizes published data on the interactions of tubulin with antimitotic compounds that inhibit the binding of vinca alkaloids to the protein. These are all relatively complex natural products isolated from higher plants, fungi and marine invertebrate animals. These agents are

Vinca site agents induce structural changes in tubulin different from and antagonistic to changes induced by colchicine site agents.

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Vinca site agents are antimicrotubule compounds that bind to the same site on tubulin as do the vinca alkaloids. These include agents that induce the formation of nonmicrotubule oligomers of tubulin (vinblastine and vincristine) and agents that do not (maytansine and rhizoxin). All of these quench

Therapeutic selectivity of vinca alkaloids: a role for guanosine 5'-triphosphate?

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Tubulin, the protein subunit of microtubules, is considered a target for antimitotic agents such as colchicine, maytansine and the vinca alkaloids vincristine and vinblastine. Of these agents, only vincristine and vinblastine have been found to have clinical utility for treatment of human neoplastic

Calmodulin, activated cyclic nucleotide phosphodiesterase, microtubules, and vinca alkaloids.

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Calmodulin 1.8 and 10.6 microM, inhibited the polymerization of bovine brain microtubules by 30 and 50%, respectively. Two 55,000- to 68,000-dalton calmodulin-binding protein as well as calmodulin-dependent and -independent phosphodiesterases (PDE) were found associated with microtubule proteins.

Cryptophycin 1 binds to tubulin at a site distinct from the colchicine binding site and at a site that may overlap the vinca binding site.

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Cryptophycin 1 is a new cytotoxic antimicrotubule agent with excellent antitumor activity. The methods of Sackett (Biochemistry, 34, 7010-7019, 1995), utilizing the selective and specific proteolysis of alpha- and beta-tubulin by trypsin and chymotrypsin, was used to identify the cryptophycin 1

Antimicrotubular drugs binding to vinca domain of tubulin.

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Studies on vinca domain binding drugs were done in great details by a number of workers as it is recognized as a potential target for anticancer drug development. Their structures, properties, mode of action, success and failures as potential anticancer drug have been discussed in short details in

Dolastatin 15 binds in the vinca domain of tubulin as demonstrated by Hummel-Dreyer chromatography.

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The antimitotic depsipeptide dolastatin 15 was radiolabeled with tritium in its amino-terminal dolavaline residue. Dolastatin 15, although potently cytotoxic, is a relatively weak inhibitor of tubulin assembly and does not inhibit the binding of any other ligand to tubulin. The only methodology

Dolastatin 10, a powerful cytostatic peptide derived from a marine animal. Inhibition of tubulin polymerization mediated through the vinca alkaloid binding domain.

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Dolastatin 10, a cytostatic peptide containing several unique amino acid subunits, was isolated from the marine shell-less mollusk Dolabella auricularia (Pettit GR, Kamano Y, Herald CL, Tuinman AA, Boettner FE, Kizu H, Schmidt JM, Baczynskyj L, Tomer KB and Bontems RJ, J Am Chem Soc 109: 6883-6885,

Binding of dolastatin 10 to tubulin at a distinct site for peptide antimitotic agents near the exchangeable nucleotide and vinca alkaloid sites.

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Dolastatin 10, a potent antimitotic peptide from a marine animal, strongly inhibits microtubule assembly, tubulin-dependent GTP hydrolysis, and the binding of vinca alkaloids to tubulin. In studies of the binding of [3H]vincristine to the protein, with vinblastine as a control for competitive

Halichondrin B and homohalichondrin B, marine natural products binding in the vinca domain of tubulin. Discovery of tubulin-based mechanism of action by analysis of differential cytotoxicity data.

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Prijava / prijava

Data generated in the new National Cancer Institute drug evaluation program, which is based on inhibition of cell growth in 60 human tumor cell lines, were used to compare new compounds with agents of known mechanism of action in terms of their differential cytotoxicity. Two marine natural products,

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