5UKJ

The co-structure of N,N-dimethyl-4-[(6R)-6-methyl-5-(1H-pyrrolo[2,3- b]pyridin-4-yl)-4,5,6,7-tetrahydropyrazolo[1,5- a]pyrazin-3-yl]benzenesulfonamide and a rationally designed PI3K-alpha mutant that mimics ATR

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

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Literature

Rationally Designed PI3K alpha Mutants to Mimic ATR and Their Use to Understand Binding Specificity of ATR Inhibitors.

Lu, Y., Knapp, M., Crawford, K., Warne, R., Elling, R., Yan, K., Doyle, M., Pardee, G., Zhang, L., Ma, S., Mamo, M., Ornelas, E., Pan, Y., Bussiere, D., Jansen, J., Zaror, I., Lai, A., Barsanti, P., Sim, J.

(2017) J Mol Biol 429: 1684-1704

  • DOI: 10.1016/j.jmb.2017.04.006
  • Primary Citation of Related Structures:  
    5UK8, 5UKJ, 5UL1

  • PubMed Abstract: 

    • ATR, a protein kinase in the PIKK family, plays a critical role in the cell DNA-damage response and is an attractive anticancer drug target. Several potent and selective inhibitors of ATR have been reported showing significant antitumor efficacy, with most advanced ones entering clinical trials ...

    ATR, a protein kinase in the PIKK family, plays a critical role in the cell DNA-damage response and is an attractive anticancer drug target. Several potent and selective inhibitors of ATR have been reported showing significant antitumor efficacy, with most advanced ones entering clinical trials. However, due to the absence of an experimental ATR structure, the determinants contributing to ATR inhibitors' potency and specificity are not well understood. Here we present the mutations in the ATP-binding site of PI3Kα to progressively transform the pocket to mimic that of ATR. The generated PI3Kα mutants exhibit significantly improved affinity for selective ATR inhibitors in multiple chemical classes. Furthermore, we obtained the X-ray structures of the PI3Kα mutants in complex with the ATR inhibitors. The crystal structures together with the analysis on the inhibitor affinity profile elucidate the roles of individual amino acid residues in the binding of ATR inhibitors, offering key insights for the binding mechanism and revealing the structure features important for the specificity of ATR inhibitors. The ability to obtain structural and binding data for these PI3Kα mutants, together with their ATR-like inhibitor binding profiles, makes these chimeric PI3Kα proteins valuable model systems for structure-based inhibitor design.

    Organizational Affiliation: 

    Oncology, Novartis Institutes for Biomedical Research, Emeryville, CA 94608, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoformA1074Homo sapiensMutation(s): 8 
Gene Names: PIK3CA
EC: 2.7.1.153 (PDB Primary Data), 2.7.11.1 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P42336 (Homo sapiens)
Explore P42336 
Go to UniProtKB:  P42336
PHAROS:  P42336
GTEx:  ENSG00000121879 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42336
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphatidylinositol 3-kinase regulatory subunit alphaB293Homo sapiensMutation(s): 1 
Gene Names: PIK3R1, GRB1
UniProt & NIH Common Fund Data Resources
Find proteins for P27986 (Homo sapiens)
Explore P27986 
Go to UniProtKB:  P27986
PHAROS:  P27986
GTEx:  ENSG00000145675 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27986
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3K6
Query on 3K6
Download Ideal Coordinates CCD File 
C [auth A]N,N-dimethyl-4-[(6R)-6-methyl-5-(1H-pyrrolo[2,3-b]pyridin-4-yl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-3-yl]benzenesulfonamide
C22 H24 N6 O2 S
UGAYOLUDSWRLMK-OAHLLOKOSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
3K6 BindingDB:  5UKJ IC50: 1.00e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.186α = 90
b = 109.432β = 90
c = 136.148γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHASERphasing
BUSTER-TNTrefinement
Cootmodel building
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-10
    Type: Initial release
  • Version 1.1: 2017-06-14
    Changes: Database references