Beta-tubulin (TUBB) (TUBB)

Beta-tubulin is a highly conserved eukaryotic protein that polymerizes with alpha-tubulin to form microtubules, which are essential components of the cellular cytoskeleton [UniProt: P07437]. These dynamic structures play a fundamental role in cell division by forming the mitotic spindle, which is responsible for the precise segregation of chromosomes into daughter cells [PubMed: 21860390]. Beyond mitosis, microtubules are critical for maintaining cell polarity, facilitating intracellular trafficking of organelles and vesicles, and enabling cell movement through cilia and flagella [NIH: PMC3155166]. In clinical practice, beta-tubulin is a major therapeutic target for anti-cancer drugs, which interfere with microtubule dynamics to induce mitotic arrest and programmed cell death [StatPearls: NBK541084]. However, because microtubules are also vital for the structural integrity and transport mechanisms of neurons, drugs targeting this protein often cause significant side effects, most notably peripheral neuropathy [PubMed: 25236393]. Resistance to tubulin-binding agents is frequently associated with the differential expression of specific beta-tubulin isotypes, such as TUBB3, making it a key area of study for personalized oncology [PubMed: 20570927].

Other names

Tubulin beta chainMicrotubule subunitTUBB family

Microtubule-targeting agents (MTAs) act via two primary mechanisms: 1) Microtubule stabilization, where drugs like taxanes and epothilones bind to the beta-tubulin subunit within the microtubule polymer, decreasing the critical concentration of tubulin required for assembly and preventing disassembly; 2) Microtubule destabilization, where drugs like vinca alkaloids and colchicine bind to tubulin dimers to inhibit their polymerization into microtubules. Both mechanisms interfere with the dynamic instability of the mitotic spindle, leading to cell cycle arrest at the G2/M phase and subsequent apoptosis [StatPearls: NBK541084; PubMed: 24507545].