PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Involved in reactive oxygen species production in response to pathogen infection. [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). Interacts with DEK3. Ubiquitous with higher levels in stems and flowers. In seeds, present in endosperm and embryo. Up-regulated by light, wounding and pathogen infection. Increased susceptibility to P.syringae infection. Belongs to the cyclophilin-type PPIase family.