3JWR

Crystal structure of chimeric PDE5/PDE6 catalytic domain complexed with 3-isobutyl-1-methylxanthine (IBMX) and PDE6 gamma-subunit inhibitory peptide 70-87.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis of phosphodiesterase 6 inhibition by the C-terminal region of the gamma-subunit

Barren, B.Gakhar, L.Muradov, H.Boyd, K.K.Ramaswamy, S.Artemyev, N.O.

(2009) EMBO J 28: 3613-3622

  • DOI: 10.1038/emboj.2009.284
  • Primary Citation of Related Structures:  
    3JWQ, 3JWR

  • PubMed Abstract: 
  • The inhibitory interaction of phosphodiesterase-6 (PDE6) with its gamma-subunit (Pgamma) is pivotal in vertebrate phototransduction. Here, crystal structures of a chimaeric PDE5/PDE6 catalytic domain (PDE5/6cd) complexed with sildenafil or 3-isobutyl ...

    The inhibitory interaction of phosphodiesterase-6 (PDE6) with its gamma-subunit (Pgamma) is pivotal in vertebrate phototransduction. Here, crystal structures of a chimaeric PDE5/PDE6 catalytic domain (PDE5/6cd) complexed with sildenafil or 3-isobutyl-1-methylxanthine and the Pgamma-inhibitory peptide Pgamma(70-87) have been determined at 2.9 and 3.0 A, respectively. These structures show the determinants and the mechanism of the PDE6 inhibition by Pgamma and suggest the conformational change of Pgamma on transducin activation. Two variable H- and M-loops of PDE5/6cd form a distinct interface that contributes to the Pgamma-binding site. This allows the Pgamma C-terminus to fit into the opening of the catalytic pocket, blocking cGMP access to the active site. Our analysis suggests that disruption of the H-M loop interface and Pgamma-binding site is a molecular cause of retinal degeneration in atrd3 mice. Comparison of the two PDE5/6cd structures shows an overlap between the sildenafil and Pgamma(70-87)-binding sites, thereby providing critical insights into the side effects of PDE5 inhibitors on vision.


    Organizational Affiliation

    Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
cGMP-specific 3',5'-cyclic phosphodiesterase catalytic domain, Cone cGMP-specific 3',5'-cyclic phosphodiesterase subunit alpha chimeraA, B330Homo sapiensMutation(s): 0 
Gene Names: PDE5A
EC: 3.1.4.35
Find proteins for O76074 (Homo sapiens)
Explore O76074 
Go to UniProtKB:  O76074
NIH Common Fund Data Resources
PHAROS  O76074
Find proteins for P51160 (Homo sapiens)
Explore P51160 
Go to UniProtKB:  P51160
NIH Common Fund Data Resources
PHAROS  P51160
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Retinal rod rhodopsin-sensitive cGMP 3',5'-cyclic phosphodiesterase subunit gammaC, D18Homo sapiensMutation(s): 0 
Gene Names: PDE6GPDEG
EC: 3.1.4.17 (PDB Primary Data), 3.1.4.35 (UniProt)
Find proteins for P18545 (Homo sapiens)
Explore P18545 
Go to UniProtKB:  P18545
NIH Common Fund Data Resources
PHAROS  P18545
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IBM
Query on IBM

Download CCD File 
A, B
3-ISOBUTYL-1-METHYLXANTHINE
C10 H14 N4 O2
APIXJSLKIYYUKG-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
IBMKi :  8.5   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.257α = 90
b = 125.651β = 90
c = 153.854γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-08-16
    Changes: Refinement description, Source and taxonomy
  • Version 1.3: 2017-11-01
    Changes: Refinement description