1KCO
Structure of e131 Zeta Peptide, a Potent Antagonist of the High-Affinity IgE Receptor
Summary for 1KCO
| Entry DOI | 10.2210/pdb1kco/pdb |
| Related | 1KCN |
| Descriptor | e131 Zeta Peptide (1 entity in total) |
| Functional Keywords | disulfide-bonded, helical, "zeta" structure, protein binding |
| Total number of polymer chains | 1 |
| Total formula weight | 2537.91 |
| Authors | Nakamura, G.R.,Reynolds, M.E.,Chen, Y.M.,Starovasnik, M.A.,Lowman, H.B. (deposition date: 2001-11-09, release date: 2002-03-06, Last modification date: 2024-11-13) |
| Primary citation | Nakamura, G.R.,Reynolds, M.E.,Chen, Y.M.,Starovasnik, M.A.,Lowman, H.B. Stable "zeta" peptides that act as potent antagonists of the high-affinity IgE receptor. Proc.Natl.Acad.Sci.USA, 99:1303-1308, 2002 Cited by PubMed Abstract: 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. PubMed: 11830661DOI: 10.1073/pnas.022635599 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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