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. 1986 Apr;83(7):2052–2055. doi: 10.1073/pnas.83.7.2052

B ring regulation of colchicine binding kinetics and fluorescence.

B Bhattacharyya, R Howard, S N Maity, A Brossi, P N Sharma, J Wolff
PMCID: PMC323228  PMID: 3457374

Abstract

Several properties of the colchicine-tubulin interaction such as association rate, reversibility, and the promotion of drug fluorescence have been related to the B ring of colchicine. The B ring itself retards the binding rate, and substitution at C-7 leads to further binding rate decreases that appear to be related to both substituent bulk and the presence of a N-acyl group. Thus, the decreasing order of binding rates is 2-methoxy-5-(2',3',4'-trimethoxyphenyl)tropone greater than deacetamidocolchicine greater than deacetylcolchicine greater than or equal to colcemid greater than colchicine greater than N-benzoyldeacetylcolchicine, etc. The apparent irreversibility of the binding seems more closely related to the presence of an N-acyl group rather than the bulk of the substituent at C-7. Substitution at C-7 also affects the tropolone fluorophore. Thus, amines (deacetylcholchicine, colcemid, or N-methylcolcemid) fluoresce poorly in the presence of tubulin, whereas substitution of the amino group with an acyl group enhances fluorescence. The presence of an N-acyl group at C-7 is essential for enhanced fluorescence. We conclude that, in addition to A- and the C-ring portion of the molecule, the B ring of colchicine is a third determinant recognized by the binding site on tubulin.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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