Crystal Structure of the human glutamate receptor, GluR5, ligand-binding core in complex with dysiherbaine in space group P1

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.172 

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Binding and Selectivity of the Marine Toxin Neodysiherbaine A and Its Synthetic Analogues to GluK1 and GluK2 Kainate Receptors.

Unno, M.Shinohara, M.Takayama, K.Tanaka, H.Teruya, K.Doh-Ura, K.Sakai, R.Sasaki, M.Ikeda-Saito, M.

(2011) J Mol Biol 413: 667-683

  • DOI: https://doi.org/10.1016/j.jmb.2011.08.043
  • Primary Citation of Related Structures:  
    2ZNS, 2ZNT, 2ZNU, 3FUZ, 3FV1, 3FV2, 3FVG, 3FVK, 3FVN, 3QXM

  • PubMed Abstract: 

    Dysiherbaine (DH) and neodysiherbaine A (NDH) selectively bind and activate two kainate-type ionotropic glutamate receptors, GluK1 and GluK2. The ligand-binding domains of human GluK1 and GluK2 were crystallized as bound forms with a series of DH analogues including DH, NDH, 8-deoxy-NDH, 9-deoxy-NDH and 8,9-dideoxy-NDH (MSVIII-19), isolated from natural sources or prepared by total synthesis. Since the DH analogues exhibit a wide range of binding affinities and agonist efficacies, it follows that the detailed analysis of crystal structure would provide us with a significant opportunity to elucidate structural factors responsible for selective binding and some aspects of gating efficacy. We found that differences in three amino acids (Thr503, Ser706 and Ser726 in GluK1 and Ala487, Asn690 and Thr710 in GluK2) in the ligand-binding pocket generate differences in the binding modes of NDH to GluK1 and GluK2. Furthermore, deletion of the C(9) hydroxy group in NDH alters the ligand conformation such that it is no longer suited for binding to the GluK1 ligand-binding pocket. In GluK2, NDH pushes and rotates the side chain of Asn690 (substituted for Ser706 in GluK1) and disrupts an interdomain hydrogen bond with Glu409. The present data support the idea that receptor selectivities of DH analogues resulted from the differences in the binding modes of the ligands in GluK1/GluK2 and the steric repulsion of Asn690 in GluK2. All ligands, regardless of agonist efficacy, induced full domain closure. Consequently, ligand efficacy and domain closure did not directly coincide with DH analogues and the kainate receptors.

  • Organizational Affiliation

    Frontier Research Center for Applied Atomic Sciences, Ibaraki University, Tokai, Naka, Ibaraki 319-1106, Japan. unno19@mx.ibaraki.ac.jp

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutamate receptor, ionotropic kainate 1
A, B
256Homo sapiensMutation(s): 0 
Gene Names: GRIK1
UniProt & NIH Common Fund Data Resources
Find proteins for P39086 (Homo sapiens)
Explore P39086 
Go to UniProtKB:  P39086
PHAROS:  P39086
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP39086
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on DYH

Download Ideal Coordinates CCD File 
C [auth A],
K [auth B]
(2R,3aR,6S,7R,7aR)-2-[(2S)-2-amino-2-carboxyethyl]-6-hydroxy-7-(methylamino)hexahydro-2H-furo[3,2-b]pyran-2-carboxylic acid
C12 H20 N2 O7
Query on SO4

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
F [auth A],
G [auth A],
L [auth B]
O4 S
Query on GOL

Download Ideal Coordinates CCD File 
H [auth B],
I [auth B],
J [auth B]
C3 H8 O3
Binding Affinity Annotations 
IDSourceBinding Affinity
DYH Binding MOAD:  3FV1 Ki: 0.5 (nM) from 1 assay(s)
PDBBind:  3FV1 Ki: 0.5 (nM) from 1 assay(s)
BindingDB:  3FV1 Ki: 0.74 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.172 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.486α = 80.08
b = 50.74β = 84.18
c = 63.252γ = 62.06
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-10-26
    Changes: Database references
  • Version 1.3: 2017-08-16
    Changes: Refinement description, Source and taxonomy
  • Version 1.4: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description