ISDA

Entry Detail

PDB ID:

5VLR

Keywords:

TRANSFERASE/TRANSFERASE REGULATOR

Title:

CRYSTAL STRUCTURE OF PI3K DELTA IN COMPLEX WITH A TRIFLUORO-ETHYL-PYRAZOL-PYROLOTRIAZINE INHIBITOR

Biological Source:

Source Organism:

Homo sapiens

Host Organism:

unidentified baculovirus

PDB Version:

Deposition Date:

2017-04-26

Release Date:

2017-06-07

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.80 Å

R-Value Free:

0.27

R-Value Work:

0.20

R-Value Observed:

0.21

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit delta isoform
Chain IDs:A
Chain Length:1013
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:O00329 Pfam ID:PF02192, PF00794, PF00792, PF00613, PF00454 EC:2.7.1.137

Protein Blast

Polymer Type:polypeptide(L)
Description:Phosphatidylinositol 3-kinase regulatory subunit alpha
Chain IDs:B
Chain Length:170
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:P27986 Pfam ID:PF16454 EC:2.7.1.137

Ligand Molecules

9EM

Primary Citation

Identification of a Potent, Selective, and Efficacious Phosphatidylinositol 3-Kinase delta (PI3K delta ) Inhibitor for the Treatment of Immunological Disorders.

Liu, Q, Shi, Q, Marcoux, D, Batt, D.G, Cornelius, L, Qin, L.Y, Ruan, Z, Neels, J, Beaudoin-Bertrand, M, Srivastava, A.S, Li, L, Cherney, R.J, Gong, H, Watterson, S.H, Weigelt, C, Gillooly, K.M, McIntyre, K.W, Xie, J.H, Obermeier, M.T, Fura, A, Sleczka, B, Stefanski, K, Fancher, R.M, Padmanabhan, S, Rp, T, Kundu, I, Rajareddy, K, Smith, R, Hennan, J.K, Xing, D, Fan, J, Levesque, P.C, Ruan, Q, Pitt, S, Zhang, R, Pedicord, D, Pan, J, Yarde, M, Lu, H, Lippy, J, Goldstine, C, Skala, S, Rampulla, R.A, Mathur, A, Gupta, A, Arunachalam, P.N, Sack, J.S, Muckelbauer, J.K, Cvijic, M.E, Salter-Cid, L.M, Bhide, R.S, Poss, M.A, Hynes, J, Carter, P.H, Macor, J.E, Ruepp, S, Schieven, G.L, Tino, J.A.Show

J. Med. Chem. 60 5193 5208 (2017)

PMID: 28541707 DOI: 10.1021/acs.jmedchem.7b00618

Abstact

PI3Kδ plays an important role controlling immune cell function and has therefore been identified as a potential target for the treatment of immunological disorders. This article highlights our work toward the identification of a potent, selective, and efficacious PI3Kδ inhibitor. Through careful SAR, the successful replacement of a polar pyrazole group by a simple chloro or trifluoromethyl group led to improved Caco-2 permeability, reduced Caco-2 efflux, reduced hERG PC activity, and increased selectivity profile while maintaining potency in the CD69 hWB assay. The optimization of the aryl substitution then identified a 4'-CN group that improved the human/rodent correlation in microsomal metabolic stability. Our lead molecule is very potent in PK/PD assays and highly efficacious in a mouse collagen-induced arthritis model.

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