Oct 26, 1989

A receptor for the immunosuppressant FK506 is a cis-trans peptidyl-prolyl isomerase

M W HardingS L Schreiber


The structurally novel macrolide FK506 (refs 1,2) has recently been demonstrated to have potent immunosuppressive activity at concentrations several hundredfold lower than cyclosporin A (CsA). Cyclosporin A, a cyclic peptide, has found widespread clinical use in the prevention of graft rejection following bone marrow and organ transplantation. The mechanisms of immunosuppression mediated by FK506 and CsA appear to be remarkably similar, suggesting that these unrelated structures act on a common receptor or on similar molecular targets, perhaps the CsA receptor, cyclophilin, which has recently been shown by Fischer et al. and Takahashi et al. to have cis-trans peptidyl-prolyl isomerase activity. We have prepared an FK506 affinity matrix and purified a binding protein for FK506 from bovine thymus and from human spleen. This FK506-binding protein (FKBP) has a relative molecular mass (Mr) of approximately 14,000(14K), a pI of 8.8-8.9, and does not cross-react with antisera against cyclophilin. The first 40 N-terminal residues of the bovine and 16 residues of the human FKBP were determined; the 16-residue fragments are identical to each other and unrelated to any known sequences. This protein catalyses the cis-trans isomerization of...Continue Reading

Mentioned in this Paper

Decreased Immunologic Activity [PE]
Macrolide Antibiotics
Neoplasm of Uncertain or Unknown Behavior of Thymus
Bone Marrow
Immune Sera

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