Download MendeleyTargeting Specific PDZ Domains of PSD-95; Structural Basis for Enhanced Affinity and Enzymatic Stability of a Cyclic Peptide.
Piserchio, A., Salinas, G.D., Li, T., Marshall, J., Spaller, M.R., Mierke, D.F.(2004) Chem Biol 11: 469-473
- PubMed: 15123241
- DOI: https://doi.org/10.1016/j.chembiol.2004.03.013
- Primary Citation of Related Structures:
1RGR - PubMed Abstract:
A cyclic peptide, Tyr-Lys-c[-Lys-Thr-Glu(betaAla)-]-Val, incorporating a beta-Ala lactam side chain linker and designed to target the PDZ domains of the postsynaptic density protein 95 (PSD-95), has been synthesized and structurally characterized by NMR while free and bound to the PDZ1 domain of PSD-95. While bound, the lactam linker of the peptide makes a number of unique contacts outside the canonical PDZ binding motif, providing a novel target for PDZ-domain specificity as well as producing a 10-fold enhancement in binding affinity. Additionally, the cyclization greatly enhances the enzymatic stability, increasing the duration that the peptide inhibits the association between PSD-95 and glutamate receptors, effectively inhibiting the clustering of kainate receptors for over 14 hr after application. Highly specific regulation of kainate receptor action may provide a novel route for treatment of drug addiction and epilepsy.
Organizational Affiliation:
Department of Chemistry, Division of Biology & Medicine, Brown University, Providence, RI 02912 USA.
