Tubulin folding cofactor C (TBCC)

Tubulin folding cofactor C (TBCC) is a protein chaperone critical for assembling functional α/β-tubulin heterodimers, which are the building blocks of microtubules[2][4]. TBCC acts as part of a multi-step folding pathway: after tubulin monomers are partially folded by the CCT chaperonin, TBCC participates in the final arrangement and release of assembly-competent tubulin heterodimers[2][4]. TBCC also has GTPase-activating protein (GAP) activity for small GTPases such as Arl2/Alp41, thereby modulating microtubule homeostasis and dynamics[1]. TBCC is implicated in cancer biology due to its role in regulating microtubules, which are targets of multiple chemotherapeutic agents[5]. Mutations in TBCC may be linked to diseases such as retinitis pigmentosa and certain forms of paralysis[2]. TBCC does not fit the common definitions of "receptor," "enzyme," or "transporter," but its function as a chaperone and GAP places it in the "other" category for molecular classification. TBCC is considered a valid molecular target for research in oncology and neurobiology, but is not the subject of current FDA-approved therapeutics.

Other names

Tubulin-specific chaperone CTubulin-folding cofactor CTBCCCFCtubulin-specific chaperone C

Not a classical drug target; but as a molecular chaperone, TBCC indirectly regulates microtubule stability, thus potentially altering sensitivity to microtubule-targeting agents (e.g., taxanes, vinca alkaloids in cancer chemotherapy[5]). Functions as a GAP for specific small GTPases (Arl2/Alp41), affecting microtubule dynamics[1]. Chaperone-dependent protein folding pathway[2][4].