3R0H

Structure of INAD PDZ45 in complex with NG2 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The INAD scaffold is a dynamic, redox-regulated modulator of signaling in the Drosophila eye

Liu, W.Wen, W.Wei, Z.Yu, J.Ye, F.Liu, C.-H.Hardie, R.C.Zhang, M.

(2011) Cell 145: 1088-1101

  • DOI: 10.1016/j.cell.2011.05.015
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • INAD is a scaffolding protein that regulates signaling in Drosophila photoreceptors. One of its PDZ domains, PDZ5, cycles between reduced and oxidized forms in response to light, but it is unclear how light affects its redox potential. Through bioche ...

    INAD is a scaffolding protein that regulates signaling in Drosophila photoreceptors. One of its PDZ domains, PDZ5, cycles between reduced and oxidized forms in response to light, but it is unclear how light affects its redox potential. Through biochemical and structural studies, we show that the redox potential of PDZ5 is allosterically regulated by its interaction with another INAD domain, PDZ4. Whereas isolated PDZ5 is stable in the oxidized state, formation of a PDZ45 "supramodule" locks PDZ5 in the reduced state by raising the redox potential of its Cys606/Cys645 disulfide bond by ∼330 mV. Acidification, potentially mediated via light and PLCβ-mediated hydrolysis of PIP(2), disrupts the interaction between PDZ4 and PDZ5, leading to PDZ5 oxidation and dissociation from the TRP Ca(2+) channel, a key component of fly visual signaling. These results show that scaffolding proteins can actively modulate the intrinsic redox potentials of their disulfide bonds to exert regulatory roles in signaling.


    Organizational Affiliation

    Division of Life Science, Molecular Neuroscience Center, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Inactivation-no-after-potential D protein
A, B, C, D, E, F, G, H
206Drosophila melanogasterMutation(s): 0 
Gene Names: inaD
Find proteins for Q24008 (Drosophila melanogaster)
Go to UniProtKB:  Q24008
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
NG2
a, b, c, d, e, f, g, h
9N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
C, G, H
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
DTV
Query on DTV

Download SDF File 
Download CCD File 
B
(2S,3S)-1,4-DIMERCAPTOBUTANE-2,3-DIOL
C4 H10 O2 S2
VHJLVAABSRFDPM-QWWZWVQMSA-N
 Ligand Interaction
DTT
Query on DTT

Download SDF File 
Download CCD File 
A, B, D
2,3-DIHYDROXY-1,4-DITHIOBUTANE
1,4-DITHIOTHREITOL
C4 H10 O2 S2
VHJLVAABSRFDPM-IMJSIDKUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 73.079α = 90.00
b = 134.988β = 90.00
c = 215.986γ = 90.00
Software Package:
Software NamePurpose
SHARPphasing
HKL-2000data scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-11-30
    Type: Initial release