6GJB

Erk2 signalling protein

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 

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Ligand Structure Quality Assessment 


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Literature

Quantitation of ERK1/2 inhibitor cellular target occupancies with a reversible slow off-rate probe.

Lebraud, H., Surova, O., Courtin, A., O'Reilly, M., Valenzano, C.R., Nordlund, P., Heightman, T.D.

(2018) Chem Sci 9: 8608-8618

  • DOI: 10.1039/c8sc02754d
  • Primary Citation of Related Structures:  
    6GJB, 6GJD

  • PubMed Abstract: 

    • Target engagement is a key concept in drug discovery and its direct measurement can provide a quantitative understanding of drug efficacy and/or toxicity. Failure to demonstrate target occupancy in relevant cells and tissues has been recognised as a contributing factor to the low success rate of clinical drug development ...

    Target engagement is a key concept in drug discovery and its direct measurement can provide a quantitative understanding of drug efficacy and/or toxicity. Failure to demonstrate target occupancy in relevant cells and tissues has been recognised as a contributing factor to the low success rate of clinical drug development. Several techniques are emerging to quantify target engagement in cells; however, in situ measurements remain challenging, mainly due to technical limitations. Here, we report the development of a non-covalent clickable probe, based on SCH772984, a slow off-rate ERK1/2 inhibitor, which enabled efficient pull down of ERK1/2 protein via click reaction with tetrazine tagged agarose beads. This was used in a competition setting to measure relative target occupancy by selected ERK1/2 inhibitors. As a reference we used the cellular thermal shift assay, a label-free biophysical assay relying solely on ligand-induced thermodynamic stabilization of proteins. To validate the EC 50 values measured by both methods, the results were compared with IC 50 data for the phosphorylation of RSK, a downstream substrate of ERK1/2 used as a functional biomarker of ERK1/2 inhibition. We showed that a slow off-rate reversible probe can be used to efficiently pull down cellular proteins, significantly extending the potential of the approach beyond the need for covalent or photoaffinity warheads.

    Organizational Affiliation: 

    Astex Pharmaceuticals , 436 Cambridge Science Park , Cambridge , CB4 0QA , UK . Email: honorine.lebraud@astx.com ; Email: tom.heightman@astx.com.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mitogen-activated protein kinase 1A368Homo sapiensMutation(s): 0 
Gene Names: MAPK1, ERK2, PRKM1, PRKM2
EC: 2.7.11.24
UniProt & NIH Common Fund Data Resources
Find proteins for P28482 (Homo sapiens)
Explore P28482 
Go to UniProtKB:  P28482
PHAROS:  P28482
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28482
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
F0H
Query on F0H
Download Ideal Coordinates CCD File 
G [auth A][(1~{R},4~{Z})-cyclooct-4-en-1-yl] ~{N}-[4-[4-[[4-[1-[(1~{S})-1-(4-chloranyl-3-fluoranyl-phenyl)-2-oxidanyl-ethyl]-2-oxidanylidene-pyridin-4-yl]pyrimidin-2-yl]amino]pyridin-2-yl]but-3-ynyl]carbamate
C35 H34 Cl F N6 O4
ORLWNASDTJFKIF-ABXFUJLBSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
B [auth A],
C [auth A],
D [auth A],
E [auth A],
F [auth A]		SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CME
Query on CME		A L-PEPTIDE LINKINGC5 H11 N O3 S2CYS
Binding Affinity Annotations 
IDSourceBinding Affinity
F0H Binding MOAD:  6GJB IC50: 8 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.804α = 90
b = 70.596β = 109.2
c = 60.023γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
Aimlessdata scaling
BUSTERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

  • Deposited Date: 2018-05-16 
  • Released Date: 2019-01-02 
    • Deposition Author(s): O'Reilly, M.

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-02
    Type: Initial release