Structure-based optimization of a peptidyl inhibitor against calcineurin-nuclear factor of activated T cell (NFAT) interaction.

Qian Z, Dougherty PG, Liu T, Oottikkal S, Hogan PG, Hadad CM, Pei D
J Med Chem 57 7792-7 09/25/2014

Abstract

Calcineurin inhibitors such as cyclosporine A and FK506 are effective immunosuppressants but produce severe side effects. Rational modification of a previously reported peptide inhibitor, GPHPVIVITGPHEE (KD ∼ 500 nM), by replacing the two valine residues with tert-leucine and the C-terminal proline with a cis-proline analogue, gave an improved inhibitor ZIZIT-cisPro, which binds to calcineurin with a KD value of 2.6 nM and is more resistant to proteolysis.

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