PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Involved in histone deacetylase complexes, suggesting a function in chromatin. Imports fructose-1,6-bisphosphatase (FBPase) into the intermediate vacuole import and degradation (Vid) vesicles. Regulates the meiotic gene program via the Set3C histone deacetylase complex to promote efficient sporulation, and the prolyl-isomerase activity is required for this function. [protein]-peptidylproline (omega=180) = [protein]-peptidylproline (omega=0) Binds cyclosporin A (CsA). CsA mediates some of its effects via an inhibitory action on PPIase. Interacts with a complex composed of SIN3 and RPD3. Identified in the Set3C complex with HOS2, HST1, SNT1, SIF2, HOS4/YIL112W and SET3. Present with 86000 molecules/cell in log phase SD medium. Belongs to the cyclophilin-type PPIase family. PPIase A subfamily.