PPIases accelerate the folding of proteins (PubMed:1702215). It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides (PubMed:1702215). [protein]-peptidylproline (omega=180) = [protein]-peptidylproline (omega=0) Binds cyclosporin A (CsA) (PubMed:1702215). CsA mediates some of its effects via an inhibitory action on PPIase (PubMed:1702215). Expressed in leaves, floral buds, growing shoots and stamens at anthesis. Belongs to the cyclophilin-type PPIase family.