Structural basis for a high affinity inhibitor bound to protein kinase MK2.
The Ser/Thr protein kinase MAPKAP kinase 2 (MK2) plays a crucial role in inflammation. We determined the structure of the kinase domain of MK2 in complex with a low molecular mass inhibitor in two different crystal forms, obtained from soaking and co-crystallization. To our knowledge, these are the first structures of MK2 showing the binding mode of an inhibitor with high binding affinity (IC50 8.5 nM). The two crystal forms revealed conformational flexibility in the binding site and extend the experimental basis for rational drug design. Crystal form-1 contained one MK2 molecule per asymmetric unit. Form-2 contained 12 molecules, which arrange into two different types of MK2 trimers. One of them may serve as a model for an intermediate state during substrate phosphorylation, as each MK2 monomer places its activation segment into the substrate peptide binding groove of the trimer neighbor.
Hillig
Roman C
RC
Bayer Schering Pharma AG, Research Laboratories, D-13342 Berlin, Germany. roman.hillig@schering.de <roman.hillig@schering.de>
Eberspaecher
Uwe
U
Monteclaro
Felipe
F
Huber
Martina
M
Nguyen
Duy
D
Mengel
Anne
A
Muller-Tiemann
Beate
B
Egner
Ursula
U
D000255:Adenosine Triphosphate / Q000737:chemistry; D000595:Amino Acid Sequence; D001665:Binding Sites; D003460:Crystallization; D019281:Dimerization; D015195:Drug Design; D004583:Electrons; D004791:Enzyme Inhibitors / Q000737:chemistry*; D020128:Inhibitory Concentration 50; D047908:Intracellular Signaling Peptides and Proteins; D008958:Models, Molecular; D008968:Molecular Conformation; D008969:Molecular Sequence Data; D011485:Protein Binding; D011487:Protein Conformation; D011494:Protein Kinases / Q000737:chemistry*; D017346:Protein Serine-Threonine Kinases; D000099190:MAP-Kinase-Activated Kinase 2
D000255:Adenosine Triphosphate; D004791:Enzyme Inhibitors; D047908:Intracellular Signaling Peptides and Proteins; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; D000099190:MAP-Kinase-Activated Kinase 2