Molecular chaperone; assists the folding of proteins upon ATP hydrolysis. Known to play a role, in vitro, in the folding of actin and tubulin (By similarity). Required for correct subcellular localization of pgl-1. Heterooligomeric complex. Low and diffuse subcellular localization of pgl-1 in embryos rather than confined to granules in somatic cells. Belongs to the TCP-1 chaperonin family.