5JKC

Crystal structure of human IZUMO1-JUNO complex (crystal form 1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of IZUMO1-JUNO reveals sperm-oocyte recognition during mammalian fertilization

Ohto, U.Ishida, H.Krayukhina, E.Uchiyama, S.Inoue, N.Shimizu, T.

(2016) Nature 534: 566-569

  • DOI: 10.1038/nature18596
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Fertilization is a fundamental process in sexual reproduction, creating a new individual through the combination of male and female gametes. The IZUMO1 sperm membrane protein and its counterpart oocyte receptor JUNO have been identified as essential ...

    Fertilization is a fundamental process in sexual reproduction, creating a new individual through the combination of male and female gametes. The IZUMO1 sperm membrane protein and its counterpart oocyte receptor JUNO have been identified as essential factors for sperm-oocyte interaction and fusion. However, the mechanism underlying their specific recognition remains poorly defined. Here, we show the crystal structures of human IZUMO1, JUNO and the IZUMO1-JUNO complex, establishing the structural basis for the IZUMO1-JUNO-mediated sperm-oocyte interaction. IZUMO1 exhibits an elongated rod-shaped structure comprised of a helical bundle IZUMO domain and an immunoglobulin-like domain that are each firmly anchored to an intervening β-hairpin region through conserved disulfide bonds. The central β-hairpin region of IZUMO1 provides the main platform for JUNO binding, while the surface located behind the putative JUNO ligand binding pocket is involved in IZUMO1 binding. Structure-based mutagenesis analysis confirms the biological importance of the IZUMO1-JUNO interaction. This structure provides a major step towards elucidating an essential phase of fertilization and it will contribute to the development of new therapeutic interventions for fertility, such as contraceptive agents.


    Organizational Affiliation

    Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Izumo sperm-egg fusion protein 1
A
246Homo sapiensMutation(s): 0 
Gene Names: IZUMO1
Find proteins for Q8IYV9 (Homo sapiens)
Go to Gene View: IZUMO1
Go to UniProtKB:  Q8IYV9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Sperm-egg fusion protein Juno
B
221Homo sapiensMutation(s): 0 
Gene Names: IZUMO1R (FOLR4, JUNO)
Find proteins for A6ND01 (Homo sapiens)
Go to Gene View: IZUMO1R
Go to UniProtKB:  A6ND01
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.225 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 65.188α = 90.00
b = 144.750β = 90.00
c = 141.880γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-06-22
    Type: Initial release
  • Version 1.1: 2016-06-29
    Type: Database references