Enables peptidyl-prolyl cis-trans isomerase activity. Predicted to be involved in protein folding. Located in obsolete cell. Expressed in excretory system. Human ortholog(s) of this gene implicated in several diseases, including Bell's palsy; aggressive periodontitis; and gastrointestinal system cancer (multiple). Is an ortholog of human PPIA (peptidylprolyl isomerase A); PPIAL4C (peptidylprolyl isomerase A like 4C); and PPIF (peptidylprolyl isomerase F).