1RPQ

High Affinity IgE Receptor (alpha chain) Complexed with Tight-Binding E131 'zeta' Peptide from Phage Display


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.294 
  • R-Value Observed: 0.294 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.2 of the entry. See complete history


Literature

Convergent Recognition of the IgE Binding Site on the High-Affinity IgE Receptor.

Stamos, J.Eigenbrot, C.Nakamura, G.R.Reynolds, M.E.Yin, J.P.Lowman, H.B.Fairbrother, W.J.Starovasnik, M.A.

(2004) Structure 12: 1289-1301

  • DOI: https://doi.org/10.1016/j.str.2004.04.015
  • Primary Citation of Related Structures:  
    1RPQ

  • PubMed Abstract: 

    Two structurally distinct classes of peptides were recently identified by phage display that bind the high-affinity IgE receptor, FcepsilonRI, and block IgE binding and subsequent receptor activation. Both classes adopt highly stable structures in solution, one forming a beta hairpin, with the other forming a helical "zeta" structure. Despite these differences, the two classes bind competitively to the same site on the receptor. Structural analyses of both peptide-receptor complexes by NMR spectroscopy and/or X-ray crystallography reveal that the unrelated peptide scaffolds have nevertheless converged to present a similar three-dimensional surface to interact with FcepsilonRI and that their modes of interaction share a key feature of the IgE-FcepsilonRI complex, the proline/tryptophan sandwich.


  • Organizational Affiliation

    Department of Protein Engineering, Genentech, Inc., One DNA Way, South San Francisco, CA 94080 USA. star@gene.com


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
High affinity immunoglobulin epsilon receptor alpha-subunit precursor
A, B, C, D
176Homo sapiensMutation(s): 0 
Gene Names: FCER1AFCE1A
UniProt & NIH Common Fund Data Resources
Find proteins for P12319 (Homo sapiens)
Explore P12319 
Go to UniProtKB:  P12319
PHAROS:  P12319
GTEx:  ENSG00000179639 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP12319
Glycosylation
Glycosylation Sites: 4Go to GlyGen: P12319-1
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Peptide E131E [auth W],
F [auth X],
G [auth Y],
H [auth Z]
21N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseI [auth E],
L [auth H]
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G47362BJ
GlyCosmos:  G47362BJ
GlyGen:  G47362BJ
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-3)-[beta-D-mannopyranose-(1-4)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseJ [auth F],
M [auth I],
P [auth L],
S [auth O]
5N-Glycosylation
Glycosylation Resources
GlyTouCan:  G85872LH
GlyCosmos:  G85872LH
GlyGen:  G85872LH
Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseK [auth G],
N [auth J],
Q [auth M],
T [auth P]
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Entity ID: 6
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseO [auth K],
R [auth N]
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
U [auth A],
W [auth B],
X [auth C],
Z [auth D]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
CIT
Query on CIT

Download Ideal Coordinates CCD File 
AA [auth D],
Y [auth C]
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
BA [auth Z],
V [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.294 
  • R-Value Observed: 0.294 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 199.7α = 90
b = 149.7β = 90
c = 104.1γ = 90
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-07-20
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2023-08-23
    Changes: Advisory, Data collection, Database references, Refinement description, Structure summary
  • Version 2.2: 2024-10-09
    Changes: Structure summary