5TAR

Crystal structure of farnesylated and methylated kras4b in complex with PDE-delta (crystal form II - with ordered hypervariable region)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 

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Ligand Structure Quality Assessment 


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Literature

Structural basis of recognition of farnesylated and methylated KRAS4b by PDE delta.

Dharmaiah, S.Bindu, L.Tran, T.H.Gillette, W.K.Frank, P.H.Ghirlando, R.Nissley, D.V.Esposito, D.McCormick, F.Stephen, A.G.Simanshu, D.K.

(2016) Proc Natl Acad Sci U S A 113: E6766-E6775

  • DOI: https://doi.org/10.1073/pnas.1615316113
  • Primary Citation of Related Structures:  
    5TAR, 5TB5

  • PubMed Abstract: 

    Farnesylation and carboxymethylation of KRAS4b (Kirsten rat sarcoma isoform 4b) are essential for its interaction with the plasma membrane where KRAS-mediated signaling events occur. Phosphodiesterase-δ (PDEδ) binds to KRAS4b and plays an important role in targeting it to cellular membranes. We solved structures of human farnesylated-methylated KRAS4b in complex with PDEδ in two different crystal forms. In these structures, the interaction is driven by the C-terminal amino acids together with the farnesylated and methylated C185 of KRAS4b that binds tightly in the central hydrophobic pocket present in PDEδ. In crystal form II, we see the full-length structure of farnesylated-methylated KRAS4b, including the hypervariable region. Crystal form I reveals structural details of farnesylated-methylated KRAS4b binding to PDEδ, and crystal form II suggests the potential binding mode of geranylgeranylated-methylated KRAS4b to PDEδ. We identified a 5-aa-long sequence motif (Lys-Ser-Lys-Thr-Lys) in KRAS4b that may enable PDEδ to bind both forms of prenylated KRAS4b. Structure and sequence analysis of various prenylated proteins that have been previously tested for binding to PDEδ provides a rationale for why some prenylated proteins, such as KRAS4a, RalA, RalB, and Rac1, do not bind to PDEδ. Comparison of all four available structures of PDEδ complexed with various prenylated proteins/peptides shows the presence of additional interactions due to a larger protein-protein interaction interface in KRAS4b-PDEδ complex. This interface might be exploited for designing an inhibitor with minimal off-target effects.


  • Organizational Affiliation

    NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21701.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase KRas185Homo sapiensMutation(s): 0 
Gene Names: KRASKRAS2RASK2
UniProt & NIH Common Fund Data Resources
Find proteins for P01116 (Homo sapiens)
Explore P01116 
Go to UniProtKB:  P01116
PHAROS:  P01116
GTEx:  ENSG00000133703 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01116
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Retinal rod rhodopsin-sensitive cGMP 3',5'-cyclic phosphodiesterase subunit delta148Homo sapiensMutation(s): 0 
Gene Names: PDE6DPDED
UniProt & NIH Common Fund Data Resources
Find proteins for O43924 (Homo sapiens)
Explore O43924 
Go to UniProtKB:  O43924
PHAROS:  O43924
GTEx:  ENSG00000156973 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43924
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CMT
Query on CMT
A
L-PEPTIDE LINKINGC4 H9 N O2 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.14α = 90
b = 70.495β = 90
c = 84.684γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XSCALEdata scaling
XDSdata reduction
PHASERphasing
PDB_EXTRACTdata extraction
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-02
    Type: Initial release
  • Version 1.1: 2016-11-16
    Changes: Structure summary
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description