Beta-tubulin protein (β-tubulin)

Beta-tubulin is a major component of microtubules, which are dynamic, hollow filaments that form part of the eukaryotic cytoskeleton, providing structural support, enabling intracellular transport, and driving forceful processes such as cell division and migration[1][4][5][7]. Beta-tubulin heterodimerizes with alpha-tubulin to form the microtubule polymer backbone. Each monomer has distinct binding sites for GTP (energy for polymerization), drugs (such as taxanes and vinca alkaloids), and motor/microtubule-associated proteins[1]. Microtubules composed of beta- and alpha-tubulin are essential for chromosome segregation during mitosis, neurodevelopment, and the integrity of cellular architecture[2][5]. Specific isotypes, such as TUBB3, have distinct functional and clinical roles, particularly in neurological development and disease, as well as in the sensitivity and resistance of cancer cells to antimitotic chemotherapies[2][5]. Mutations or dysregulation of beta-tubulin are implicated in various human diseases, including cancer, inherited neurological disorders, and acquired chemoresistance[2][4][5].

Other names

Tubulin beta chainTUBBTUBB1TUBB2TUBB3TUBB4TUBB5 (gene-dependent)Microtubule protein beta subunitBeta-tubulin isotypes

Microtubule stabilization (e.g., paclitaxel binds β-tubulin, stabilizes microtubules, arrests cell division) Microtubule destabilization/polymerization inhibition (e.g., vinca alkaloids and colchicine bind β-tubulin, inhibit polymerization or promote depolymerization, block mitosis) Disruption of intracellular transport