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Default Thermodynamic and NMR analyses of NADPH binding to lipocalin-type prostaglandin D synthase.

Thermodynamic and NMR analyses of NADPH binding to lipocalin-type prostaglandin D synthase.

Related Articles Thermodynamic and NMR analyses of NADPH binding to lipocalin-type prostaglandin D synthase.

Biochem Biophys Res Commun. 2015 Oct 27;

Authors: Qin S, Shimamoto S, Maruno T, Kobayashi Y, Kawahara K, Yoshida T, Ohkubo T

Abstract
Lipocalin-type prostaglandin D synthase (L-PGDS) is one of the most abundant proteins in human cerebrospinal fluid (CSF) with dual functions as a prostaglandin D2 (PGD2) synthase and a transporter of lipophilic ligands. Recent studies revealed that L-PGDS plays important roles in protecting against various neuronal diseases induced by reactive oxygen species (ROS). However, the molecular mechanisms of such protective actions of L-PGDS remain unknown. In this study, we conducted thermodynamic and nuclear magnetic resonance (NMR) analyses, and demonstrated that L-PGDS binds to nicotinamide coenzymes, including NADPH, NADP(+), and NADH. Although a hydrophilic ligand is not common for L-PGDS, these ligands, especially NADPH showed specific interaction with L-PGDS at the upper pocket of its ligand-binding cavity with an unusually bifurcated shape. The binding affinity of L-PGDS for NADPH was comparable to that previously reported for NADPH oxidases and NADPH in vitro. These results suggested that L-PGDS potentially attenuates the activities of NADPH oxidases through interaction with NADPH. Given that NADPH is the substrate for NADPH oxidases that play key roles in neuronal cell death by generating excessive ROS, these results imply a novel linkage between L-PGDS and ROS.


PMID: 26518650 [PubMed - as supplied by publisher]



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