Selective inhibition of monoamine oxidase A by purpurin,an anthraquinone |
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Authors: | Hyun Woo Lee Hyung Won Ryu Myung-Gyun Kang Daeui Park Sei-Ryang Oh Hoon Kim |
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Affiliation: | 1. Department of Pharmacy and Research Institute of Life Pharmaceutical Sciences, Sunchon National University, Suncheon 57922, Republic of Korea;2. Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology, 30 Yeongudanji-ro, Ochang-eup, Cheongju, Chungbuk 28116, Republic of Korea;3. Department of Predictive Toxicology, Korea Institute of Toxicology, Daejeon 34114, Republic of Korea |
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Abstract: | Monoamine oxidase (MAO) catalyzes the oxidation of monoamines that act as neurotransmitters. During a target-based screening of natural products using two isoforms of recombinant human MAO-A and MAO-B, purpurin (an anthraquinone derivative) was found to potently and selectively inhibit MAO-A, with an IC50 value of 2.50 μM, and not to inhibit MAO-B. Alizarin (also an anthraquinone) inhibited MAO-A less potently with an IC50 value of 30.1 μM. Furthermore, purpurin was a reversible and competitive inhibitor of MAO-A with a Ki value of 0.422 μM. A comparison of their chemical structures suggested the 4-hydroxy group of purpurin might play an important role in its inhibition of MAO-A. Molecular docking simulation showed that the binding affinity of purpurin for MAO-A (?40.0 kcal/mol) was higher than its affinity for MAO-B (?33.9 kcal/mol), and that Ile 207 and Gly 443 of MAO-A were key residues for hydrogen bonding with purpurin. The findings of this study suggest purpurin is a potent, selective, reversible inhibitor of MAO-A, and that it be considered a new potential lead compound for development of novel reversible inhibitors of MAO-A (RIMAs). |
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Keywords: | Purpurin Monoamine oxidase A Selective inhibitor Competitive inhibitor Molecular docking |
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