Oxidation of N-nitroethylenediamine, a GABA analog from agaricus silvaticus, by GABA aminotransferase

Bioactive Phytochemical Constituents of Wild Edible Mushrooms from Southeast Asia

Mushrooms have a long history of uses for their medicinal and nutritional properties. They have been consumed by people for thousands of years. Edible mushrooms are collected in the wild or cultivated worldwide. Recently, mushroom extracts and their secondary metabolites have acquired considerable attention due to their biological effects, which include antioxidant, antimicrobial, anti-cancer, anti-inflammatory, anti-obesity, and immunomodulatory activities. Thus, in addition to phytochemists, nutritionists and consumers are now deeply interested in the phytochemical constituents of mushrooms, which provide beneficial effects to humans in terms of health promotion and reduction of disease-related risks. In recent years, scientific reports on the nutritional, phytochemical and pharmacological properties of mushroom have been overwhelming. However, the bioactive compounds and biological properties of wild edible mushrooms growing in Southeast Asian countries have been rarely described. In this review, the bioactive compounds isolated from 25 selected wild edible mushrooms growing in Southeast Asia have been reviewed, together with their biological activities. Phytoconstituents with antioxidant and antimicrobial activities have been highlighted. Several evidences indicate that mushrooms are good sources for natural antioxidants and antimicrobial agents.

Inactivation of GABA aminotransferase by 3-nitro-1-propanamine

3-Nitro-1-propanamine is a close structural analog of the neuro-transmitter GABA. The nitro compound is a good substrate for the GABA aminotransferase from porcine brain. However, it inactivates the GABA aminotransferase from GABA-grown Pseudomonas fluorescens in a slowly reversible reaction. Both enzymes are inactivated by the homolog 4-nitro-1-butanamine.