Catalyzes the cis-trans isomerization of peptidyl prolyl bonds and accelerates protein folding (By similarity). Also exhibits chaperone-like activity (PubMed:21262232). [protein]-peptidylproline (omega=180) = [protein]-peptidylproline (omega=0) Homodimer. Contains an N-terminal PPIase domain, an IF (Insert in the Flap) domain and a C-terminal domain (CTD). The CTD mediates dimerization. Chaperone activity requires both the IF domain and the CTD. Belongs to the FKBP-type PPIase family.