期刊
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
卷 -, 期 -, 页码 -出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/07391102.2023.2225106
关键词
PKMYT1; WEE1; molecular dynamics simulations; binding free energy; gatekeeper residue
In this study, the binding selectivity mechanism of RP-6306 towards PKMYT1 was uncovered using molecular docking, molecular dynamics simulations, and free energy calculations. The results clarified the binding specificity of RP-6306 reported in previous bioassays and showed that the selectivity largely derived from protein-ligand electrostatic interactions. The critical factor responsible for the binding selectivity was identified as the non-conserved gatekeeper residue Thr187 in PKMYT1.
Protein kinase, membrane-associated tyrosine/threonine 1 (PKMYT1), a member of the WEE family and responsible for the regulation of CDK1 phosphorylation, has been considered a promising therapeutic target for cancer therapy. However, the highly structural conservation of the ATP-binding sites of the WEE family poses a challenge to the design of selective inhibitors for PKMYT1. Here, molecular docking, multiple microsecond-length molecular dynamics (MD) simulations and end-point free energy calculations were performed to uncover the molecular mechanism of the binding selectivity of RP-6306 toward PKMYT1 over its highly homologous kinase WEE1. The binding specificity of RP-6306 reported in previous experimental bioassays was clarified by MD simulations and binding free energy calculations. Further, the binding free energy prediction indicated that the binding selectivity of RP-6306 largely derived from the difference in the protein-ligand electrostatic interactions. The per-residue free energy decomposition suggested that the non-conserved gatekeeper residue in the hinge domain of PKMYT1/WEE1, Thr187/Asn376, is the critical factor responsible for the binding selectivity of RP-6306 toward PKMYT1. In addition, a water-mediated hydrogen bond was formed between RP-6306 and Gly191 at the hinge domain in the PKMYT1/RP-6306 complex, which was absent in the WEE1/RP-6306 complex. This study is expected to offer useful information for the design of more potent and selective PKMYT1 inhibitors.Communicated by Ramaswamy H. Sarma
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