Molecular chaperone; assists the folding of proteins upon ATP hydrolysis (By similarity). Known to play a role, in vitro, in the folding of actin and tubulin (By similarity). Plays a role in microtubule polymerization (PubMed:16054029). RNAi-mediated knockdown results in severely reduced microtubule growth rate. Belongs to the TCP-1 chaperonin family.