Open AccessRemoval of estrogenic activity of endocrine‐disrupting genistein by ligninolytic enzymes from white rot fungi
Author(s) -
Tamagawa Yuuki,
Hirai Hirofumi,
Kawai Shingo,
Nishida Tomoaki
Publication year - 2005
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1016/j.femsle.2005.01.023
Subject(s) - genistein , laccase , enzyme , biochanin a , phanerochaete , manganese peroxidase , chemistry , peroxidase , biochemistry , biology , daidzein , endocrinology
Endocrine‐disrupting genistein was treated with the white rot fungus Phanerochaete sordida YK‐624 under ligninolytic condition with low‐nitrogen and high‐carbon culture medium. Genistein decreased by 93% after 4 days of treatment and the activities of ligninolytic enzymes, manganese peroxidase (MnP) and laccase, were detected during treatment, thus suggesting that the disappearance of genistein is related to ligninolytic enzymes produced extracellularly by white rot fungi. Therefore, genistein was treated with MnP, laccase, and the laccase‐mediator system with 1‐hydroxybenzotriazole (HBT) as a mediator. HPLC analysis demonstrated that genistein disappeared almost completely in the reaction mixture after 4 h of treatment with either MnP, laccase, or the laccase–HBT system. Using the yeast two‐hybrid assay system, it was also confirmed that three enzymatic treatments completely removed the estrogenic activity of genistein after 4 h. These results strongly suggest that ligninolytic enzymes are effective in removing the estrogenic activity of genistein.