5P9F

BTK IN COMPLEX WITH GDC-0834

Summary for 5P9F

• Entry DOI: 10.2210/pdb5p9f/pdb
• Group deposition: Crystal structures of Tyrosine-protein kinase BTK in complex with inhibitors (G_1002011)
• Descriptor: Tyrosine-protein kinase BTK, N-{3-[6-({4-[(2R)-1,4-dimethyl-3-oxopiperazin-2-yl]phenyl}amino)-4-methyl-5-oxo-4,5-dihydropyrazin-2-yl]-2-methylphenyl }-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxamide, 1,2-ETHANEDIOL, ... (5 entities in total)
• Functional Keywords: lead optimization, protein kinase, transferase
• Biological source: Homo sapiens (Human)
• Cellular location: Cytoplasm: Q06187
• Total number of polymer chains: 1
• Total formula weight: 33263.18

Authors

Gardberg, A.S. (deposition date: 2016-09-20, release date: 2017-05-24, Last modification date: 2024-05-22)

Primary citation

Bender, A.T.,Gardberg, A.,Pereira, A.,Johnson, T.,Wu, Y.,Grenningloh, R.,Head, J.,Morandi, F.,Haselmayer, P.,Liu-Bujalski, L.
Ability of Bruton's Tyrosine Kinase Inhibitors to Sequester Y551 and Prevent Phosphorylation Determines Potency for Inhibition of Fc Receptor but not B-Cell Receptor Signaling.
Mol. Pharmacol., 91:208-219, 2017

PubMed Abstract: Bruton's tyrosine kinase (Btk) is expressed in a variety of hematopoietic cells. Btk has been demonstrated to regulate signaling downstream of the B-cell receptor (BCR), Fc receptors (FcRs), and toll-like receptors. It has become an attractive drug target because its inhibition may provide significant efficacy by simultaneously blocking multiple disease mechanisms. Consequently, a large number of Btk inhibitors have been developed. These compounds have diverse binding modes, and both reversible and irreversible inhibitors have been developed. Reported herein, we have tested nine Btk inhibitors and characterized on a molecular level how their interactions with Btk define their ability to block different signaling pathways. By solving the crystal structures of Btk inhibitors bound to the enzyme, we discovered that the compounds can be classified by their ability to trigger sequestration of Btk residue Y551. In cells, we found that sequestration of Y551 renders it inaccessible for phosphorylation. The ability to sequester Y551 was an important determinant of potency against FcεR signaling as Y551 sequestering compounds were more potent for inhibiting basophils and mast cells. This result was true for the inhibition of FcγR signaling as well. In contrast, Y551 sequestration was less a factor in determining potency against BCR signaling. We also found that Btk activity is regulated differentially in basophils and B cells. These results elucidate important determinants for Btk inhibitor potency against different signaling pathways and provide insight for designing new compounds with a broader inhibitory profile that will likely result in greater efficacy.

PubMed: 28062735
DOI: 10.1124/mol.116.107037

Experimental method

X-RAY DIFFRACTION (1.71 Å)