Design of small molecules for CDK-2 inhibition in colorectal cancer based on substructure search

The global frequency of colorectal cancer motivates extensive drug discovery efforts. CDK2, a key member of the CDK family, has been linked to tumor progression, unregulated cell proliferation, and growth promotion. Water-soluble flavonoids with a fast metabolism called anthocyanins have been shown to have a variety of pharmacological properties, including anti-cancer properties. This study aims to find possible CDK2 inhibitors from Anthocyanin-like molecules. Anthocyanins sourced from PubChem were screened using a virtual screening approach that included a KNIME workflow, QSAR-model, Pharmacophore hypothesis, and a structure-based screening to identify compounds with a better binding affinity and predicted bioactivity compared to the standard, Sorafenib. The top compounds were subjected to a 100 ns MD simulation to confirm their stability at the active site. Compounds 1-5 were shown to have higher binding affinity and bioactivity in this study. These substances interacted with the critical amino acids (LEU 83, ASP 145 and LYS 89) at CDK2's active site. Compared to the reference with a pIC50 value of 6.003 nM, the top compounds listed have superior predicted bioactivity ranging from 6.539 to 6.36 nM. Also, ADMET predictions predicted that Compounds 1-5 were not carcinogenic and not a p-glycoprotein substrate. MD simulation also validated Compound 1's stability at the active site compared to the standard. This study uncovers potential CDK2 inhibitors with good binding affinities, shedding light on their interactions with the target protein. While promising, further in vivo and in vitro investigations are essential to validate the anticancer potential of these compounds.Communicated by Ramaswamy H. Sarma.