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) Binds cyclosporin A (CsA). CsA mediates some of its effects via an inhibitory action on PPIase (By similarity). Not induced by infection with virulent or avirulent P.syringae. Not induced by phenylmethylsulfonyl fluoride (PMSF) and yeast elicitator (YE). Belongs to the cyclophilin-type PPIase family.