1kcn
From Proteopedia
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|PDB= 1kcn |SIZE=350|CAPTION= <scene name='initialview01'>1kcn</scene> | |PDB= 1kcn |SIZE=350|CAPTION= <scene name='initialview01'>1kcn</scene> | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=NH2:AMINO GROUP'>NH2</scene> | + | |LIGAND= <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1kco|1KCO]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1kcn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kcn OCA], [http://www.ebi.ac.uk/pdbsum/1kcn PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1kcn RCSB]</span> | ||
}} | }} | ||
| Line 26: | Line 29: | ||
[[Category: Reynolds, M E.]] | [[Category: Reynolds, M E.]] | ||
[[Category: Starovasnik, M A.]] | [[Category: Starovasnik, M A.]] | ||
| - | [[Category: NH2]] | ||
[[Category: zeta structure]] | [[Category: zeta structure]] | ||
[[Category: disulfide-bonded]] | [[Category: disulfide-bonded]] | ||
[[Category: helical]] | [[Category: helical]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:46:36 2008'' |
Revision as of 18:46, 30 March 2008
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| Ligands: | |||||||
| Related: | 1KCO
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structure of e109 Zeta Peptide, an Antagonist of the High-Affinity IgE Receptor
Overview
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.
About this Structure
1KCN is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
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
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