1kcn

Structure of e109 Zeta Peptide, an Antagonist of the High-Affinity IgE Receptor

spinqualitylabelsall models 1kcn Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1kcn is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 20 models Ligands: NH2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Recently we described a family of peptides, unrelated in sequence to IgE, that form stable beta-hairpins in solution and inhibit IgE activity in the microM range [Nakamura, G. R., Starovasnik, M. A., Reynolds, M. E. & Lowman, H. B. (2001) Biochemistry 40, 9828-9835]. Using an expanded set of peptide-phage libraries, we found a simpler motif, X(2)CPX(2)CYX, for binding to the high-affinity IgE receptor. In solution, one of these peptides spontaneously formed a covalent antiparallel dimer. We subsequently linked these monomers in a single-chain construct on phage and optimized receptor binding. Ultimately, peptides with 30 nM affinity were produced. NMR studies showed that the peptide adopts a stable fold consisting of two "zeta" (zeta)-shaped moieties. Structure-activity analyses reveal a single binding site created by the zeta-dimer, with two tyrosine residues important for structural stability and two proline residues important for Fc epsilon RI binding. The peptides inhibit histamine release from cultured cells and are extremely stable in biological fluids. The zeta peptides appear to act as competitive IgE inhibitors and suggest possibilities for design of novel IgE antagonists. Stable "zeta" peptides that act as potent antagonists of the high-affinity IgE receptor.,Nakamura GR, Reynolds ME, Chen YM, Starovasnik MA, Lowman HB Proc Natl Acad Sci U S A. 2002 Feb 5;99(3):1303-8. PMID:11830661 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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