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A cytosolic binding protein for the immunosuppressant FK506 has peptidyl-prolyl isomerase activity but is distinct from cyclophilin

Abstract

CYCLOSPORIN A and the newly discovered immunosuppressant, FK-506, are potent inhibitors of T cell activation1. In addition to their clinical importance in the prevention of allograft rejection, cyclosporin A and FK-506 represent important reagents for the study of the molecular mechanisms of lymphocyte activation. Cyclosporin A, a cyclic undecapeptide and FK-506, a macrolide, although chemically distinct, inhibit similar lymphocyte activation responses1, 2. The earliest responses inhibited in the T cell seem to be the expression of early phase T cell-activation genes for inter-leu kins 2, 3 and 4, granulocyte-macrophage colony stimulating factor and gamma interferon2–4. Although FK-506 and cyclosporin A seem to inhibit similar signal transduction processes, they do so by interacting with distinct cytosolic proteins5, 6. We report here the purification to homogeneity of a specific FK-506 binding protein that is distinct from the cyclosporin A-binding protein, cyclophilin7, 8. In addition, we show that this FK-506 binding protein, like cyclophilin, has peptidyl-prolyl isomerase activity9, 10.

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Siekierka, J., Hung, S., Poe, M. et al. A cytosolic binding protein for the immunosuppressant FK506 has peptidyl-prolyl isomerase activity but is distinct from cyclophilin. Nature 341, 755–757 (1989). https://doi.org/10.1038/341755a0

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