Tubulin vinca binding site

Tubulin is a heterodimeric protein composed of alpha and beta subunits that polymerizes to form microtubules, which are essential for maintaining cell structure, facilitating intracellular transport, and enabling cell division [13, 14]. The vinca site, or vinca domain, is a specific binding pocket located at the longitudinal interface between two tubulin heterodimers [2, 15]. Drugs targeting this site, such as the vinca alkaloids (e.g., vincristine, vinblastine) and eribulin, act as microtubule-destabilizing agents by inhibiting the addition of tubulin dimers to the growing ends of microtubules [3, 11]. This disruption prevents the assembly of the mitotic spindle, leading to cell cycle arrest in the M-phase and the induction of apoptosis [3, 17]. Consequently, the vinca site is a major therapeutic target in oncology for treating various hematological malignancies and solid tumors [9, 11]. However, because microtubules are also vital for axonal transport, drugs affecting this site are frequently associated with dose-limiting peripheral neurotoxicity [9, 16].

Other names

Vinca domainVinca binding siteVinca alkaloid binding siteTubulin vinca domain

Vinca site agents bind to the vinca domain at the longitudinal interface between two tubulin heterodimers, which inhibits the addition of tubulin subunits to the plus ends of microtubules [2, 15]. This action destabilizes microtubules, prevents the formation of a functional mitotic spindle, and induces tubulin self-association into non-microtubule aggregates [6, 11]. These effects collectively lead to cell cycle arrest in the M-phase and subsequent apoptosis [3, 17].