7LM2

HUMAN PI3KDELTA IN COMPLEX WITH COMPOUND 3C

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.79 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history. 


Literature

Projected Dose Optimization of Amino- and Hydroxypyrrolidine Purine PI3K delta Immunomodulators.

Methot, J.L., Zhou, H., McGowan, M.A., Anthony, N.J., Christopher, M., Garcia, Y., Achab, A., Lipford, K., Trotter, B.W., Altman, M.D., Fradera, X., Lesburg, C.A., Li, C., Alves, S., Chappell, C.P., Jain, R., Mangado, R., Pinheiro, E., Williams, S.M.G., Goldenblatt, P., Hill, A., Shaffer, L., Chen, D., Tong, V., McLeod, R.L., Lee, H.H., Yu, H., Shah, S., Katz, J.D.

(2021) J Med Chem 64: 5137-5156

  • DOI: 10.1021/acs.jmedchem.1c00237
  • Primary Citation of Related Structures:  
    7LM2

  • PubMed Abstract: 

    • The approvals of idelalisib and duvelisib have validated PI3Kδ inhibitors for the treatment for hematological malignancies driven by the PI3K/AKT pathway. Our program led to the identification of structurally distinct heterocycloalkyl purine inhibitors with excellent isoform and kinome selectivity; however, they had high projected human doses ...

    The approvals of idelalisib and duvelisib have validated PI3Kδ inhibitors for the treatment for hematological malignancies driven by the PI3K/AKT pathway. Our program led to the identification of structurally distinct heterocycloalkyl purine inhibitors with excellent isoform and kinome selectivity; however, they had high projected human doses. Improved ligand contacts gave potency enhancements, while replacement of metabolic liabilities led to extended half-lives in preclinical species, affording PI3Kδ inhibitors with low once-daily predicted human doses. Treatment of C57BL/6-Foxp3-GDL reporter mice with 30 and 100 mg/kg/day of 3c (MSD-496486311) led to a 70% reduction in Foxp3-expressing regulatory T cells as observed through bioluminescence imaging with luciferin, consistent with the role of PI3K/AKT signaling in Treg cell proliferation. As a model for allergic rhinitis and asthma, treatment of ovalbumin-challenged Brown Norway rats with 0.3 to 30 mg/kg/day of 3c gave a dose-dependent reduction in pulmonary bronchoalveolar lavage inflammation eosinophil cell count.

    Organizational Affiliation: 

    Discovery Chemistry, Merck & Co., Inc., 33 Avenue Louis Pasteur, Boston, Massachusetts 02115 United States.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit delta isoformA1020Homo sapiensMutation(s): 0 
Gene Names: PIK3CD
EC: 2.7.1.153
UniProt & NIH Common Fund Data Resources
Find proteins for O00329 (Homo sapiens)
Explore O00329 
Go to UniProtKB:  O00329
PHAROS:  O00329
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00329
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphatidylinositol 3-kinase regulatory subunit alphaB169Homo sapiensMutation(s): 0 
Gene Names: PIK3R1, GRB1
UniProt & NIH Common Fund Data Resources
Find proteins for P27986 (Homo sapiens)
Explore P27986 
Go to UniProtKB:  P27986
PHAROS:  P27986
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27986
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Y5Y (Subject of Investigation/LOI)
Query on Y5Y
Download Ideal Coordinates CCD File 
C [auth A]cyclopropyl[(3S)-3-{[9-ethyl-8-(2-methylpyrimidin-5-yl)-9H-purin-6-yl]amino}pyrrolidin-1-yl]methanone
C20 H24 N8 O
DADGJAZOHPBTCZ-HNNXBMFYSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
E [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
EDO
Query on EDO
Download Ideal Coordinates CCD File 
D [auth A]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.79 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.284α = 90
b = 109.308β = 90
c = 142.579γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
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: 2021-04-21
    Type: Initial release
  • Version 1.1: 2021-05-05
    Changes: Database references