Tubulin alpha-beta heterodimer (Tubulin)

Tubulin heterodimers are the fundamental structural subunits of microtubules, composed of tightly linked alpha and beta tubulin proteins [1]. These dimers polymerize to form dynamic microtubule structures that are essential for various cellular processes, including the maintenance of cell shape, intracellular vesicle transport, and the formation of the mitotic spindle during cell division [2]. Due to their indispensable role in mitosis, tubulin heterodimers are highly effective therapeutic targets in oncology, where drugs disrupt microtubule assembly or disassembly to induce cell cycle arrest and apoptosis [3]. Beyond cancer, tubulin is a target for anti-inflammatory treatments, such as colchicine for gout, which works by inhibiting the polymerization of microtubules in neutrophils [4]. However, because tubulin is also critical for axonal transport in neurons, many tubulin-binding agents are associated with dose-limiting peripheral neuropathy [5]. Understanding the specific isoforms and post-translational modifications of tubulin remains a key area of research for developing more selective and less toxic therapies [6].

Other names

Alpha-beta tubulinMicrotubule subunitTubulin dimerTubulin alpha/beta complex

Drugs targeting tubulin heterodimers generally fall into two categories: microtubule-stabilizing agents (e.g., taxanes) and microtubule-destabilizing agents (e.g., vinca alkaloids) [3]. Stabilizers bind to the polymerized microtubule and prevent its breakdown, while destabilizers bind to the tubulin dimers themselves to prevent their assembly into microtubules; both mechanisms result in the disruption of the mitotic spindle, leading to M-phase cell cycle arrest [5].