Journal of Microbiology and Biotechnology
The Korean Society for Microbiology and Biotechnology publishes the Journal of Microbiology and Biotechnology.

2017 ; Vol.27-4: 785~790

AuthorHyun Woo Lee, Hansol Choi, Sang-Jip Nam, William Fenical, Hoon Kim
Place of dutyDepartment of Pharmacy and Research Institute of Life Pharmaceutical Sciences, Sunchon National University, Suncheon 57922, Republic of Korea
TitlePotent Inhibition of Monoamine Oxidase B by a Piloquinone from Marine-Derived Streptomyces sp. CNQ-027
PublicationInfo J. Microbiol. Biotechnol.2017 ; Vol.27-4
AbstractTwo piloquinone derivatives isolated from Streptomyces sp. CNQ-027 were tested for the inhibitory activities of two isoforms of monoamine oxidase (MAO), which catalyzes monoamine neurotransmitters. The piloquinone 4,7-dihydroxy-3-methyl-2-(4-methyl-1- oxopentyl)-6H-dibenzo[b,d]pyran-6-one (1) was found to be a highly potent inhibitor of human MAO-B, with an IC50 value of 1.21 μM; in addition, it was found to be highly effective against MAO-A, with an IC50 value of 6.47 μM. Compound 1 was selective, but not extremely so, for MAO-B compared with MAO-A, with a selectivity index value of 5.35. Compound 1,8- dihydroxy-2-methyl-3-(4-methyl-1-oxopentyl)-9,10-phenanthrenedione (2) was moderately effective for the inhibition of MAO-B (IC50 = 14.50 μM) but not for MAO-A (IC50 > 80 μM). There was no time-dependency in inhibition of MAO-A or -B by compound 1, and the MAO-A and -B activities were almost completely recovered in the dilution experiments with an excess amount of compound 1. Compound 1 showed competitive inhibition for MAO-A and -B, with Ki values of 0.573 and 0.248 μM, respectively. These results suggest that piloquinones from a microbial source could be potent reversible MAO inhibitors and may be useful lead compounds for developing MAO enzyme inhibitors to treat related disorders, such as depression, Parkinson’s disease, and Alzheimer’s disease.
Full-Text
Key_wordMonoamine oxidase, piloquinone, Streptomyces sp. CNQ-027, potent selective inhibitor, competitive inhibitor
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