Tubulin (TUB) (TUB)

Tubulin is a highly conserved globular protein that functions as the structural subunit of microtubules, which are vital for maintaining cell shape, intracellular transport, and the formation of the mitotic spindle during cell division (UniProt P68363). It exists primarily as a heterodimer of alpha-tubulin and beta-tubulin subunits. In the context of oncology, tubulin is a critical therapeutic target; drugs like vincristine bind specifically to the vinca domain at the interface of tubulin dimers (StatPearls NBK519525). This binding prevents the polymerization of tubulin into microtubules, causing the disruption of the mitotic spindle and arresting the cell cycle in metaphase (PubMed PMC3136731). Consequently, this leads to the induction of apoptosis in rapidly dividing cancer cells, making it a cornerstone in the treatment of various leukemias, lymphomas, and solid tumors. Beyond its role in mitosis, tubulin is essential for neuronal structure and transport, which explains why drugs targeting it often result in neurotoxic side effects. Resistance to tubulin-binding agents can occur through the expression of specific tubulin isotypes, such as beta-III tubulin, which alter microtubule dynamics (PubMed PMC2671028). Overall, tubulin remains one of the most successful targets in clinical chemotherapy due to its fundamental role in cell proliferation.

Other names

Alpha-tubulinBeta-tubulinMicrotubule proteinVinca alkaloid binding siteTubulin heterodimer

Inhibition of microtubule polymerization by binding to the vinca domain of tubulin heterodimers, leading to mitotic arrest in metaphase and subsequent apoptosis (StatPearls NBK519525).