PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides (By similarity). [protein]-peptidylproline (omega=180) = [protein]-peptidylproline (omega=0) Interacts with SCL28, SCL30, SR34, RNU1 and SNRNP35. Expressed in leaves, flowers, roots and stems. Belongs to the cyclophilin-type PPIase family.