PMID: 27827355

Authors:

Caspers NL, Han S, Rajamohan F, Hoth LR, Geoghegan KF, Subashi TA, Vazquez ML, Kaila N, Cronin CN, Johnson E, Kurumbail RG

Title:

Development of a high-throughput crystal structure-determination platform for JAK1 using a novel metal-chelator soaking system.

Journal:

Acta Crystallogr F Struct Biol Commun. 2016 Nov 1;72(Pt 11):840-845. doi:, 10.1107/S2053230X16016356. Epub 2016 Oct 27.

Abstract:

Crystals of phosphorylated JAK1 kinase domain were initially generated in complex with nucleotide (ADP) and magnesium. The tightly bound Mg(2+)-ADP at the ATP-binding site proved recalcitrant to ligand displacement. Addition of a molar excess of EDTA helped to dislodge the divalent metal ion, promoting the release of ADP and allowing facile exchange with ATP-competitive small-molecule ligands. Many kinases require the presence of a stabilizing ligand in the ATP site for crystallization. This procedure could be useful for developing co-crystallization systems with an exchangeable ligand to enable structure-based drug design of other protein kinases.