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Selective Inhibition of Monoamine Oxidase A by Purpurin, an Anthraquinone

Selective Inhibition of Monoamine Oxidase A by Purpurin, an Anthraquinone

Hyun Woo Lee, Hyung Won Ryu, Myung-Gyun Kang, Daeui Park, Sei-Ryang Oh, Hoon Kim

Bioorg Med Chem Lett. 2017 Mar 1;27(5):1136-1140.

PMID: 28188065

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 2.50μM, and not to inhibit MAO-B. Alizarin (also an anthraquinone) inhibited MAO-A less potently with an IC50 value of 30.1μM. Furthermore, purpurin was a reversible and competitive inhibitor of MAO-A with a Ki value of 0.422μM. 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 (-40.0kcal/mol) was higher than its affinity for MAO-B (-33.9kcal/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).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP81549	Purpurin		81-54-9	Price

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