Microtubule polymerization and stabilization

Microtubule polymerization and stabilization refer to the dynamic processes governing the assembly and maintenance of microtubules—hollow cylindrical polymers composed primarily of α/β-tubulin heterodimers. These processes are essential for cellular functions such as mitosis, intracellular transport, maintenance of cell shape, and motility. The dynamic instability of microtubules arises from cycles of growth and shrinkage at their ends due to GTP hydrolysis on β-tubulin; this property is exploited therapeutically by drugs that either stabilize or destabilize microtubules. Agents like paclitaxel stabilize the lattice against disassembly by binding within the lumen or at specific sites on tubulin subunits[1][3]. Others like vinblastine inhibit proper assembly but may also kinetically stabilize certain interactions[1]. Disruption in these dynamics can lead to diseases such as cancer—where anti-microtubule agents are widely used chemotherapeutics—and neurodegenerative disorders where abnormal stability leads to pathological aggregates[4][5]. While "microtubule polymerization/stabilization" describes a critical biological process targeted pharmacologically, it is not itself a discrete molecular entity but rather an activity modulated through direct interaction with structural proteins like tubulins or regulatory factors such as CSPP1[3], tau protein[5], etc.

Other names

Microtubule dynamicsMicrotubule assembly/disassemblyTubulin polymerization/stabilization

Stabilization of microtubules by binding and preventing depolymerization (e.g., paclitaxel)[1][3] Destabilization by inhibiting polymerization or promoting disassembly (e.g., vinblastine, colchicine)[1][6]