5JD7

PKG I's Carboxyl Terminal Cyclic Nucleotide Binding Domain (CNB-B) in a complex with PET-cGMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.197 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Structural Basis of Analog Specificity in PKG I and II.

Campbell, J.C.Henning, P.Franz, E.Sankaran, B.Herberg, F.W.Kim, C.

(2017) ACS Chem Biol 12: 2388-2398

  • DOI: https://doi.org/10.1021/acschembio.7b00369
  • Primary Citation of Related Structures:  
    5J48, 5JAX, 5JD7, 5JIX

  • PubMed Abstract: 

    Cyclic GMP analogs, 8-Br, 8-pCPT, and PET-cGMP, have been widely used for characterizing cellular functions of cGMP-dependent protein kinase (PKG) I and II isotypes. However, interpreting results obtained using these analogs has been difficult due to their low isotype specificity. Additionally, each isotype has two binding sites with different cGMP affinities and analog selectivities, making understanding the molecular basis for isotype specificity of these compounds even more challenging. To determine isotype specificity of cGMP analogs and their structural basis, we generated the full-length regulatory domains of PKG I and II isotypes with each binding site disabled, determined their affinities for these analogs, and obtained cocrystal structures of both isotypes bound with cGMP analogs. Our affinity and activation measurements show that PET-cGMP is most selective for PKG I, whereas 8-pCPT-cGMP is most selective for PKG II. Our structures of cyclic nucleotide binding (CNB) domains reveal that the B site of PKG I is more open and forms a unique π/π interaction through Arg285 at β4 with the PET moiety, whereas the A site of PKG II has a larger β5/β6 pocket that can better accommodate the bulky 8-pCPT moiety. Our structural and functional results explain the selectivity of these analogs for each PKG isotype and provide a starting point for the rational design of isotype selective activators.


  • Organizational Affiliation

    Structural and Computational Biology and Molecular Biophysics Program, Baylor College of Medicine , Houston, Texas, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cGMP-dependent protein kinase 1135Homo sapiensMutation(s): 0 
Gene Names: PRKG1PRKG1BPRKGR1APRKGR1B
EC: 2.7.11.12
UniProt & NIH Common Fund Data Resources
Find proteins for Q13976 (Homo sapiens)
Explore Q13976 
Go to UniProtKB:  Q13976
PHAROS:  Q13976
GTEx:  ENSG00000185532 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13976
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
6JR
Query on 6JR

Download Ideal Coordinates CCD File 
B [auth A]3-[(2S,4aR,6R,7R,7aS)-2,7-dihydroxy-2-oxotetrahydro-2H,4H-2lambda~5~-furo[3,2-d][1,3,2]dioxaphosphinin-6-yl]-6-phenyl-3,4-dihydro-9H-imidazo[1,2-a]purin-9-one
C18 H16 N5 O7 P
TVSIKYJKUPRIDV-LSCFUAHRSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
6JR BindingDB:  5JD7 EC50: min: 2, max: 18 (nM) from 4 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.197 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.29α = 90
b = 46.29β = 90
c = 102.46γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-08-09
    Type: Initial release
  • Version 1.1: 2017-08-23
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Database references
  • Version 1.3: 2023-09-27
    Changes: Data collection, Database references, Refinement description