sentences:  This encoded protein is a cis-trans prolyl isomerase that binds to the immunosuppressants FK506 and rapamycin.It has high structural and functional similarity to FK506-binding protein 1A (FKBP1A), but unlike FKBP1A, this protein does not have immunosuppressant activity when complexed with FK506.It interacts with interferon regulatory factor-4 and plays an important role in immunoregulatory gene expression in B and T lymphocytes.