Cphn 2, Cphn2, CyP 20b, CYP S1, CYP-S1, CYPB, MGC14109, MGC2224, peptidyl prolyl cis trans isomerase B, Peptidyl prolyl cis trans isomerase B precursor, Peptidyl-prolyl cis-trans isomerase B precursor, Peptidylprolyl isomerase B, PPIase, PPIB, Rotamase, S cyclophilin, SCYLP, PPIB_HUMAN.
The cyclophilins are a conserved class of proteins that bind the immunosuppressive drug cyclosporin A (CsA) with high affinity. CsA blocks helper T-cell activation at a step between T-cell receptor stimulation and the transcriptional activation of cytokine genes. Cyclophilins from many species possess peptidyl-prolyl cis-trans isomerase (PPIase) activity that is blocked by CsA and therefore may be relevant in CsA-mediated immunosuppression.