Microtubule network protein beta-tubulin subunit (Beta-tubulin)

Beta-tubulin is one half of the alpha/beta tubulin heterodimer that forms the basic building block of microtubules, which are cylindrical polymers critical for maintaining eukaryotic cell structure, intracellular transport, chromosome segregation during mitosis/meiosis, ciliary/flagellar motility, and other essential cellular processes. Each monomer binds GTP; GTP bound at the E-site on β-subunit can be hydrolyzed after incorporation into the growing microtube filament—a process central to dynamic instability required for normal function. Multiple gene products/isotypes exist with tissue-specific expression patterns; these differences can influence drug sensitivity/resistance profiles. The intermediate domain contains binding sites for important anticancer drugs such as paclitaxel/taxol. Because disruption or stabilization of this system impairs cell division—especially in rapidly proliferating tumor cells—beta-tublin has become a major focus for chemotherapeutic intervention but also presents challenges related to toxicity due its fundamental role across many healthy tissues.

Other names

Beta-tubulinβ-tubulinTubB (in some bacterial contexts)TUBB (gene symbol for human beta-tubulins)Microtubule protein beta chain

Drugs targeting beta-tubulin generally act by: - Stabilizing microtubules, preventing their depolymerization (e.g., taxanes like paclitaxel), which blocks mitosis and leads to apoptosis in rapidly dividing cells. - Destabilizing microtubules, inhibiting their polymerization or promoting disassembly (e.g., vinca alkaloids like vincristine), also leading to mitotic arrest and cell death.