Abstract
Crystals of phosphorylated JAK1 kinase domain were initially generated in complex with nucleotide (ADP) and magnesium. The tightly bound Mg2+-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.
Keywords:
Janus kinase; crystal soaking; kinases; ligand exchange; structure-based drug design.
MeSH terms
-
Adenosine Diphosphate / chemistry*
-
Adenosine Diphosphate / metabolism
-
Adenosine Triphosphate / chemistry*
-
Adenosine Triphosphate / metabolism
-
Amino Acid Sequence
-
Animals
-
Baculoviridae / genetics
-
Baculoviridae / metabolism
-
Binding Sites
-
Cations, Divalent
-
Cloning, Molecular
-
Crystallization / methods*
-
Crystallography, X-Ray
-
Edetic Acid / chemistry*
-
Gene Expression
-
Humans
-
Janus Kinase 1 / chemistry*
-
Janus Kinase 1 / genetics
-
Janus Kinase 1 / metabolism
-
Magnesium / chemistry*
-
Magnesium / metabolism
-
Models, Molecular
-
Plasmids / chemistry
-
Plasmids / metabolism
-
Protein Binding
-
Protein Conformation, alpha-Helical
-
Protein Conformation, beta-Strand
-
Protein Interaction Domains and Motifs
-
Recombinant Proteins / chemistry
-
Recombinant Proteins / genetics
-
Recombinant Proteins / metabolism
-
Sf9 Cells
-
Spodoptera
Substances
-
Cations, Divalent
-
Recombinant Proteins
-
Adenosine Diphosphate
-
Adenosine Triphosphate
-
Edetic Acid
-
JAK1 protein, human
-
Janus Kinase 1
-
Magnesium