STRUCTURE OF CAMP-DEPENDENT PROTEIN KINASE, ALPHA-CATALYTIC SUBUNIT IN COMPLEX WITH H7 PROTEIN KINASE INHIBITOR 1-(5-ISOQUINOLINESULFONYL)-2-METHYLPIPERAZINE
Crystal structures of catalytic subunit of cAMP-dependent protein kinase in complex with isoquinolinesulfonyl protein kinase inhibitors H7, H8, and H89. Structural implications for selectivity.
Primary Citation of Related Structures: 1YDR, 1YDS, 1YDT
PubMed Abstract:
The discovery of several hundred different protein kinases involved in highly diverse cellular signaling pathways is in stark contrast to the much smaller number of known modulators of cell signaling. Of these, the H series protein kinase inhibitors (1-(5-isoquinolinesulfonyl)-2-methylpiperazine (H7), N-[2-(methylamino)ethyl]-5-isoquinolinesulfonamide (H8) N-[2-(p-Bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide (H89)) are frequently used to block signaling pathways in studies of cellular regulation ...
The discovery of several hundred different protein kinases involved in highly diverse cellular signaling pathways is in stark contrast to the much smaller number of known modulators of cell signaling. Of these, the H series protein kinase inhibitors (1-(5-isoquinolinesulfonyl)-2-methylpiperazine (H7), N-[2-(methylamino)ethyl]-5-isoquinolinesulfonamide (H8) N-[2-(p-Bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide (H89)) are frequently used to block signaling pathways in studies of cellular regulation. To elucidate inhibition mechanisms at atomic resolution and to enable structure-based drug design of potential therapeutic modulators of signaling pathways, we determined the crystal structures of corresponding complexes with the cAPK catalytic subunit. Complexes with H7 and H8 (2.2 A) and with H89 (2.3 A) define the binding mode of the isoquinoline-sulfonamide derivatives in the ATP-binding site while demonstrating effects of ligand-induced structural change. Specific interactions between the enzyme and the inhibitors include the isoquinoline ring nitrogen ligating to backbone amide of Val-123 and an inhibitor side chain amide bonding to the backbone carbonyl of Glu-170. The conservation of the ATP-binding site of protein kinases allows evaluation of factors governing general selectivity of these inhibitors among kinases. These results should assist efforts in the design of protein kinase inhibitors with specific properties.
Related Citations:
Phosphotransferase and Substrate Binding Mechanism of the Camp-Dependent Protein Kinase Catalytic Subunit from Porcine Heart as Deduced from the 2.0 A Structure of the Complex with Mn2+ Adenylyl Imidodiphosphate and Inhibitor Peptide Pki(5-24) Bossemeyer, D., Engh, R.A., Kinzel, V., Ponstingl, H., Huber, R. (1993) EMBO J 12: 849
Cloning of the C Alpha Catalytic Subunit of the Bovine Camp-Dependent Protein Kinase Wiemann, S., Kinzel, V., Pyerin, W. (1992) Biochim Biophys Acta 1171: 93
Isoquinolinesulfonamides, Novel and Potent Inhibitors of Cyclic Nucleotide Dependent Protein Kinase and Protein Kinase C Hidaka, H., Inagaki, M., Kawamoto, S., Sasaki, Y. (1984) Biochemistry 23: 5036
Organizational Affiliation:
Abteilung Strukturforschung II, Max-Planck Institute for Biochemistry, D-82152 Martinsried, Federal Republic of Germany.
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