PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Thought to function as a catalyst in the folding and modification of cuticle collagens. [protein]-peptidylproline (omega=180) = [protein]-peptidylproline (omega=0) Co-expressed with pdi-1 in the syncytial hypodermis. Expression significantly up-regulated in the middle of the L3 (22 hours) and L4 (26 hours) larval stages. Belongs to the cyclophilin-type PPIase family.