A Chemical Probe for Dark Kinase STK17B Derives Its Potency and High Selectivity through a Unique P‑Loop Conformation

STK17B is a member of the death-associated protein kinase family and has been genetically linked to the development of diverse diseases. However, the role of STK17B in normal and disease pathology is poorly defined. Here, we present the discovery of thieno­[3,2-d] pyrimidine SGC-STK17B-1 (11s), a hi...

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Veröffentlicht in:Journal of medicinal chemistry 2020-12, Vol.63 (23), p.14626-14646
Hauptverfasser: Picado, Alfredo, Chaikuad, Apirat, Wells, Carrow I, Shrestha, Safal, Zuercher, William J, Pickett, Julie E, Kwarcinski, Frank E, Sinha, Parvathi, de Silva, Chandi S, Zutshi, Reena, Liu, Shubin, Kannan, Natarajan, Knapp, Stefan, Drewry, David H, Willson, Timothy M
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container_issue 23
container_start_page 14626
container_title Journal of medicinal chemistry
container_volume 63
creator Picado, Alfredo
Chaikuad, Apirat
Wells, Carrow I
Shrestha, Safal
Zuercher, William J
Pickett, Julie E
Kwarcinski, Frank E
Sinha, Parvathi
de Silva, Chandi S
Zutshi, Reena
Liu, Shubin
Kannan, Natarajan
Knapp, Stefan
Drewry, David H
Willson, Timothy M
description STK17B is a member of the death-associated protein kinase family and has been genetically linked to the development of diverse diseases. However, the role of STK17B in normal and disease pathology is poorly defined. Here, we present the discovery of thieno­[3,2-d] pyrimidine SGC-STK17B-1 (11s), a high-quality chemical probe for this understudied “dark” kinase. 11s is an ATP-competitive inhibitor that showed remarkable selectivity over other kinases including the closely related STK17A. X-ray crystallography of 11s and related thieno­[3,2-d]­pyrimidines bound to STK17B revealed a unique P-loop conformation characterized by a salt bridge between R41 and the carboxylic acid of the inhibitor. Molecular dynamic simulations of STK17B revealed the flexibility of the P-loop and a wide range of R41 conformations available to the apo-protein. The isomeric thieno­[2,3-d]­pyrimidine SGC-STK17B-1N (19g) was identified as a negative control compound. The >100-fold lower activity of 19g on STK17B was attributed to the reduced basicity of its pyrimidine N1.
doi_str_mv 10.1021/acs.jmedchem.0c01174
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Med. Chem</addtitle><date>2020-12-10</date><risdate>2020</risdate><volume>63</volume><issue>23</issue><spage>14626</spage><epage>14646</epage><pages>14626-14646</pages><issn>0022-2623</issn><issn>1520-4804</issn><eissn>1520-4804</eissn><abstract>STK17B is a member of the death-associated protein kinase family and has been genetically linked to the development of diverse diseases. However, the role of STK17B in normal and disease pathology is poorly defined. Here, we present the discovery of thieno­[3,2-d] pyrimidine SGC-STK17B-1 (11s), a high-quality chemical probe for this understudied “dark” kinase. 11s is an ATP-competitive inhibitor that showed remarkable selectivity over other kinases including the closely related STK17A. X-ray crystallography of 11s and related thieno­[3,2-d]­pyrimidines bound to STK17B revealed a unique P-loop conformation characterized by a salt bridge between R41 and the carboxylic acid of the inhibitor. Molecular dynamic simulations of STK17B revealed the flexibility of the P-loop and a wide range of R41 conformations available to the apo-protein. The isomeric thieno­[2,3-d]­pyrimidine SGC-STK17B-1N (19g) was identified as a negative control compound. 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subjects Animals
Apoptosis Regulatory Proteins - antagonists & inhibitors
Apoptosis Regulatory Proteins - chemistry
Apoptosis Regulatory Proteins - metabolism
Catalytic Domain
HEK293 Cells
Humans
Mice
Microsomes, Liver - metabolism
Molecular Dynamics Simulation
Molecular Structure
Protein Binding
Protein Conformation
Protein Kinase Inhibitors - chemical synthesis
Protein Kinase Inhibitors - metabolism
Protein Kinase Inhibitors - pharmacology
Protein Serine-Threonine Kinases - antagonists & inhibitors
Protein Serine-Threonine Kinases - chemistry
Protein Serine-Threonine Kinases - metabolism
Pyrimidines - chemical synthesis
Pyrimidines - metabolism
Pyrimidines - pharmacology
Structure-Activity Relationship
Thiophenes - chemical synthesis
Thiophenes - metabolism
Thiophenes - pharmacology
title A Chemical Probe for Dark Kinase STK17B Derives Its Potency and High Selectivity through a Unique P‑Loop Conformation
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