title: Potential Protein Phosphatase 2A Agents from Traditional Chinese Medicine against Cancer.
abstract: Protein phosphatase 2A (PP2A) is an important phosphatase which regulates various cellular processes, such as protein synthesis, cell growth, cellular signaling, apoptosis, metabolism, and stress responses. It is a holoenzyme composed of the structural A and catalytic C subunits and a regulatory B subunit. As an environmental toxin, okadaic acid, is a tumor promoter and binds to PP2A catalytic C subunit and the cancer-associated mutations in PP2A structural A subunit in human tumor tissue; PP2A may have tumor-suppressing function. It is a potential drug target in the treatment of cancer. In this study, we screen the TCM compounds in TCM Database@Taiwan to investigate the potent lead compounds as PP2A agent. The results of docking simulation are optimized under dynamic conditions by MD simulations after virtual screening to validate the stability of H-bonds between PP2A- α protein and each ligand. The top TCM candidates, trichosanatine and squamosamide, have potential binding affinities and interactions with key residues Arg89 and Arg214 in the docking simulation. In addition, these interactions were stable under dynamic conditions. Hence, we propose the TCM compounds, trichosanatine and squamosamide, as potential candidates as lead compounds for further study in drug development process with the PP2A- α protein.
authors.affiliation: School of Pharmacy, China Medical University, Taichung 40402, Taiwan.
authors.forename: Kuan-Chung
authors.identifier: 0000-0003-0223-1577
authors.initials: KC
authors.lastname: Chen
authors.affiliation: Department of Biomedical Informatics, Asia University, Taichung 41354, Taiwan.
authors.forename: Hsin-Yi
authors.initials: HY
authors.lastname: Chen
authors.affiliation: Department of Biomedical Informatics, Asia University, Taichung 41354, Taiwan ; School of Medicine, College of Medicine, China Medical University, Taichung 40402, Taiwan ; Computational and Systems Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Calvin Yu-Chian
authors.initials: CY
authors.lastname: Chen