5DXH

p110alpha/p85alpha with compound 5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

The Rational Design of Selective Benzoxazepin Inhibitors of the alpha-Isoform of Phosphoinositide 3-Kinase Culminating in the Identification of (S)-2-((2-(1-Isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepin-9-yl)oxy)propanamide (GDC-0326).

Heffron, T.P.Heald, R.A.Ndubaku, C.Wei, B.Augistin, M.Do, S.Edgar, K.Eigenbrot, C.Friedman, L.Gancia, E.Jackson, P.S.Jones, G.Kolesnikov, A.Lee, L.B.Lesnick, J.D.Lewis, C.McLean, N.Mortl, M.Nonomiya, J.Pang, J.Price, S.Prior, W.W.Salphati, L.Sideris, S.Staben, S.T.Steinbacher, S.Tsui, V.Wallin, J.Sampath, D.Olivero, A.G.

(2016) J Med Chem 59: 985-1002

  • DOI: 10.1021/acs.jmedchem.5b01483
  • Primary Citation of Related Structures:  
    5DXH, 5DXT, 5DXU

  • PubMed Abstract: 
  • Inhibitors of the class I phosphoinositide 3-kinase (PI3K) isoform PI3Kα have received substantial attention for their potential use in cancer therapy. Despite the particular attraction of targeting PI3Kα, achieving selectivity for the inhibition of this isoform has proved challenging ...

    Inhibitors of the class I phosphoinositide 3-kinase (PI3K) isoform PI3Kα have received substantial attention for their potential use in cancer therapy. Despite the particular attraction of targeting PI3Kα, achieving selectivity for the inhibition of this isoform has proved challenging. Herein we report the discovery of inhibitors of PI3Kα that have selectivity over the other class I isoforms and all other kinases tested. In GDC-0032 (3, taselisib), we previously minimized inhibition of PI3Kβ relative to the other class I insoforms. Subsequently, we extended our efforts to identify PI3Kα-specific inhibitors using PI3Kα crystal structures to inform the design of benzoxazepin inhibitors with selectivity for PI3Kα through interactions with a nonconserved residue. Several molecules selective for PI3Kα relative to the other class I isoforms, as well as other kinases, were identified. Optimization of properties related to drug metabolism then culminated in the identification of the clinical candidate GDC-0326 (4).


    Organizational Affiliation

    Genentech, Inc. , 1 DNA Way, South San Francisco, California 94080, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoformA,
C [auth D]
1067Homo sapiensMutation(s): 0 
Gene Names: PIK3CA
EC: 2.7.1.153 (PDB Primary Data), 2.7.11.1 (PDB Primary Data), 2.7.1.137 (UniProt)
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 alphaB,
D [auth E]
169Bos taurusMutation(s): 0 
Gene Names: PIK3R1
UniProt
Find proteins for P23727 (Bos taurus)
Explore P23727 
Go to UniProtKB:  P23727
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23727
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
5H2
Query on 5H2

Download Ideal Coordinates CCD File 
E [auth A],
F [auth D]
methyl {2-[4-(2-chlorophenyl)-4H-1,2,4-triazol-3-yl]-4,5-dihydrothieno[3,2-d][1]benzoxepin-8-yl}carbamate
C22 H17 Cl N4 O3 S
IMSBGZSMSGCJBM-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
5H2 BindingDB:  5DXH Ki: 1 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.66α = 90
b = 121.83β = 102.33
c = 166.36γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-27
    Type: Initial release
  • Version 1.1: 2016-02-24
    Changes: Database references