1. Optimized Plk1 PBD Inhibitors Based on Poloxin Induce Mitotic Arrest and Apoptosis in Tumor Cells.
- Author
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Scharow A, Raab M, Saxena K, Sreeramulu S, Kudlinzki D, Gande S, Dötsch C, Kurunci-Csacsko E, Klaeger S, Kuster B, Schwalbe H, Strebhardt K, and Berg T
- Subjects
- Cell Cycle Proteins classification, Cell Line, Tumor, Fluorescence, HeLa Cells, Humans, Inhibitory Concentration 50, Molecular Structure, Protein Kinase Inhibitors chemistry, Protein Kinase Inhibitors pharmacology, Protein Serine-Threonine Kinases classification, Protein Structure, Tertiary, Proto-Oncogene Proteins classification, Small Molecule Libraries chemistry, Small Molecule Libraries pharmacology, Structure-Activity Relationship, Polo-Like Kinase 1, Apoptosis drug effects, Benzoates chemistry, Benzoates pharmacology, Cell Cycle Proteins antagonists & inhibitors, Mitosis drug effects, Protein Serine-Threonine Kinases antagonists & inhibitors, Proto-Oncogene Proteins antagonists & inhibitors, Quinones chemistry, Quinones pharmacology
- Abstract
Polo-like kinase 1 (Plk1) is a central regulator of mitosis and has been validated as a target for antitumor therapy. The polo-box domain (PBD) of Plk1 regulates its kinase activity and mediates the subcellular localization of Plk1 and its interactions with a subset of its substrates. Functional inhibition of the Plk1 PBD by low-molecular weight inhibitors has been shown to represent a viable strategy by which to inhibit the enzyme, while avoiding selectivity issues caused by the conserved nature of the ATP binding site. Here, we report structure-activity relationships and mechanistic analysis for the first reported Plk1 PBD inhibitor, Poloxin. We present the identification of the optimized analog Poloxin-2, displaying significantly improved potency and selectivity over Poloxin. Poloxin-2 induces mitotic arrest and apoptosis in cultured human tumor cells at low micromolar concentrations, highlighting it as a valuable tool compound for exploring the function of the Plk1 PBD in living cells.
- Published
- 2015
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