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Identification of a distal allosteric ligand binding pocket in HtrA3.

Biochem. Biophys. Res. Commun.2019 Sep 03;516(4):1130-1136. Epub 2019 Jul 05
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摘要


Human HtrA3 (High temperature requirement protease A3) is a trimeric PDZ bearing propapoptotic serine protease, which is involved in various diseases including cancer and pre-eclampsia. Proposed to be a tumor suppressor, its role as a potential therapeutic target is strongly advocated. Therefore, it becomes imperative to gain insights into its mechanism of action and regulation. Allostery is a well-known mechanism of catalytic activation for many HtrA3 homologs, which opens up avenues for manipulating enzyme functions for therapeutic intervention. In our study, through in silico and biochemical approaches, we have reported for the first time that HtrA3 shows allosteric behaviour. We identified a novel selective binding pocket, which triggers conformational reorientations through signal propagation to the distantly situated active-site pocket via the functionally important loop regions. Using molecular docking, simulation studies and biochemical studies we have identified the regulatory movements at and around the active site pocket. Our study is the first one to report a non-classical binding site for HtrA3, which is instrumental for formation of a catalytically efficient orthosteric pocket upon substrate binding.

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