3,5,7-Substituted Pyrazolo[4,3- d]Pyrimidine Inhibitors of Cyclin-Dependent Kinases and Cyclin K Degraders

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F22%3A00562052" target="_blank" >RIV/61388963:_____/22:00562052 - isvavai.cz</a>
Alternative codes found
RIV/61389030:_____/22:00562052 RIV/00216208:11110/22:10445238 RIV/61989592:15310/22:73616092 RIV/00064165:_____/22:10445238
Result on the web
<a href="https://doi.org/10.1021/acs.jmedchem.1c02184" target="_blank" >https://doi.org/10.1021/acs.jmedchem.1c02184</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jmedchem.1c02184" target="_blank" >10.1021/acs.jmedchem.1c02184</a>

Result language
angličtina
Original language name
3,5,7-Substituted Pyrazolo[4,3- d]Pyrimidine Inhibitors of Cyclin-Dependent Kinases and Cyclin K Degraders
Original language description
3,5,7-Trisubstituted pyrazolo[4,3-d]pyrimidines have been identified as potent inhibitors of cyclin-dependent kinases (CDKs), which are established drug targets. Herein, we describe their further structural modifications leading to novel nanomolar inhibitors with strong antiproliferative activity. We determined the crystal structure of fully active CDK2/A2 with 5-(2-amino-1-ethyl)thio-3-cyclobutyl-7-[4-(pyrazol-1-yl)benzyl]amino-1(2)H-pyrazolo[4,3-d]pyrimidine (24) at 1.7 Å resolution, confirming the competitive mode of inhibition. Biochemical and cellular assays in lymphoma cell lines confirmed the expected mechanism of action through dephosphorylation of retinoblastoma protein and RNA polymerase II, leading to induction of apoptosis. Importantly, we also revealed an interesting ability of compound 24 to induce proteasome-dependent degradation of cyclin K both in vitro and in a patient-derived xenograft in vivo. We propose that 24 has a dual mechanism of action, acting as a kinase inhibitor and as a molecular glue inducing an interaction between CDK12 and DDB1 that leads to polyubiquitination of cyclin K and its subsequent degradation.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10401 - Organic chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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