Colchicine-Binding Site on Tubulin (CBSI)

The colchicine-binding site is located primarily within the β-subunit of tubulin, at the interface with the α-subunit in the αβ-tubulin heterodimer. This site is a major target for small-molecule inhibitors that disrupt microtubule dynamics, making it highly relevant for anticancer drug development. Binding of inhibitors prevents tubulin from adopting the straight conformation necessary for microtubule assembly, leading to depolymerization, cell cycle arrest, and apoptosis. Many structurally diverse compounds can bind here—these are collectively termed "colchicine-binding site inhibitors" (CBSIs). CBSIs are under active investigation as anticancer and antiparasitic agents.

Other names

Tubulin Colchicine Binding Site

Inhibition of tubulin polymerization by binding to the colchicine-binding site, leading to microtubule destabilization and cell cycle arrest.