PPIases accelerate the folding of proteins (Probable). It prefers amino acid residues with hydrophobic side chains like leucine and phenylalanine in the P1 position of the peptides substrates. [protein]-peptidylproline (omega=180) = [protein]-peptidylproline (omega=0) Not inhibited by cyclosporin A or FK506. Belongs to the PpiC/parvulin rotamase family.