Abstract
The compound tentatively named TL-1 was isolated from Talaromyced luteus as a metabolite having a monoamine oxidase (MAO) inhibitory potency. TL-1 showed mixed-type inhibition of MAO in mouse liver when kynuramine was used as a substrate, and the IC50 was 6.6 μM. The inhibition constants (Ki) for MAO-A and -B in mouse liver were 39.9 and 7.85 μM, respectively. On the other hand, the Ki values for MAO-A and -B in mouse brain were 74.0 and 0.71 μM, respectively. despite the marked structural resemblance between TL-1 and 7-episclerotiorin, the latter compound had little inhibitory effect on MAO.
