ISDA

Deposition Date 2013-02-11

Release Date 2013-08-28

Last Version Date 2024-02-28

Entry Detail

PDB ID:

4J6I

Keywords:

Transferase/Transferase Inhibitor

Title:

Discovery of thiazolobenzoxepin PI3-kinase inhibitors that spare the PI3-kinase beta isoform

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Host Organism:

Spodoptera frugiperda

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.90 Å

R-Value Free:

0.25

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

C 1 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit gamma isoform
Gene (Uniprot):PIK3CG
Chain IDs:A
Chain Length:966
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:P48736 Pfam ID:PF00794, PF00792, PF00613, PF00454 EC:2.7.1.137

Ligand Molecules

1JV

Primary Citation

Discovery of thiazolobenzoxepin PI3-kinase inhibitors that spare the PI3-kinase beta isoform.

Staben, S.T, Ndubaku, C, Blaquiere, N, Belvin, M, Bull, R.J, Dudley, D, Edgar, K, Gray, D, Heald, R, Heffron, T.P, Jones, G.E, Jones, M, Kolesnikov, A, Lee, L, Lesnick, J, Lewis, C, Murray, J, McLean, N.J, Nonomiya, J, Olivero, A.G, Ord, R, Pang, J, Price, S, Prior, W.W, Rouge, L, Salphati, L, Sampath, D, Wallin, J, Wang, L, Wei, B, Weismann, C, Wu, P.Show

Bioorg.Med.Chem.Lett. 23 2606 2613 (2013)

PMID: 23540645 DOI: 10.1016/j.bmcl.2013.02.102

Abstact

A series of suitable five-membered heterocyclic alternatives to thiophenes within a thienobenzoxepin class of PI3-kinase (PI3K) inhibitors was discovered. Specific thiazolobenzoxepin 8-substitution was identified that increased selectivity over PI3Kβ. PI3Kβ-sparing compound 27 (PI3Kβ Ki,app/PI3Kα Ki,app=57) demonstrated dose-dependent knockdown of pAKT, pPRAS40 and pS6RP in vivo as well as differential effects in an in vitro proliferation cell line screen compared to pan PI3K inhibitor GDC-0941. A new structure-based hypothesis for reducing inhibition of the PI3K β isoform while maintaining activity against α, δ and γ isoforms is presented.

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Primary Citation of related structures