Characterization of new highly selective pyrazolo[4,3-d]pyrimidine inhibitor of CDK7
Language English Country France Media print-electronic
Document type Journal Article
PubMed
36931035
DOI
10.1016/j.biopha.2023.114492
PII: S0753-3322(23)00280-9
Knihovny.cz E-resources
- Keywords
- Cyclin-dependent kinase 7, Inhibitor, Selectivity, pyrazolo[4,3-d]pyrimidine,
- MeSH
- Cell Cycle MeSH
- Cyclin-Dependent Kinases * genetics MeSH
- Phosphorylation MeSH
- Protein Kinase Inhibitors pharmacology chemistry MeSH
- Cyclin-Dependent Kinase-Activating Kinase * MeSH
- Pyrimidines pharmacology chemistry MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Cyclin-Dependent Kinases * MeSH
- Protein Kinase Inhibitors MeSH
- Cyclin-Dependent Kinase-Activating Kinase * MeSH
- Pyrimidines MeSH
Targeting cyclin-dependent kinase 7 (CDK7) provides an interesting therapeutic option in cancer therapy because this kinase participates in regulating the cell cycle and transcription. Here, we describe a new trisubstituted pyrazolo[4,3-d]pyrimidine derivative, LGR6768, that inhibits CDK7 in the nanomolar range and displays favourable selectivity across the CDK family. We determined the structure of fully active CDK2/cyclin A2 in complex with LGR6768 at 2.6 Å resolution using X-ray crystallography, revealing conserved interactions within the active site. Structural analysis and comparison with LGR6768 docked to CDK7 provides an explanation of the observed biochemical selectivity, which is linked to a conformational difference in the biphenyl moiety. In cellular experiments, LGR6768 affected regulation of the cell cycle and transcription by inhibiting the phosphorylation of cell cycle CDKs and the carboxy-terminal domain of RNA polymerase II, respectively. LGR6768 limited the proliferation of several leukaemia cell lines, triggered significant changes in protein and mRNA levels related to CDK7 inhibition and induced apoptosis in dose- and time-dependent experiments. Our work supports previous findings and provides further information for the development of selective CDK7 inhibitors.
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