Premium
Exploring adverse effects of puerarin on catalase by multiple spectroscopic investigations and docking studies in vitro
Author(s) -
Zhang Bai,
Li Ming,
Wang Qi,
Zhai Aihua
Publication year - 2019
Publication title -
journal of biochemical and molecular toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.526
H-Index - 58
eISSN - 1099-0461
pISSN - 1095-6670
DOI - 10.1002/jbt.22296
Subject(s) - puerarin , chemistry , catalase , docking (animal) , in vitro , enzyme , biochemistry , biophysics , stereochemistry , biology , medicine , alternative medicine , nursing , pathology
Puerarin belongs to one of the most familiar tradition medicines of China, but adverse effects of puerarin during the clinical treatment have been found for years, the mechanisms of which remain unclear. In this study, toxic mechanisms of puerarin on the structure and function of catalase were studied by multiple spectroscopic techniques, isothermal titration calorimetric measurement, and molecular docking methods in vitro. Results showed puerarin could inhibit the activity of catalase due to direct interactions between puerarin and catalase, resulting in conformational and functional changes of the enzyme. To be specific, puerarin statically quenched catalase fluorescence, bound into the active site channel of catalase, hindered the path of the catalytic substrate (H 2 O 2 ), affected its skeleton conformation and secondary structure, and interacted with the enzymatically related residues through hydrophobic interactions (Δ H > 0 and Δ S > 0) spontaneously (Δ G < 0). This study illustrates potential adverse effects of puerarin, which should catch more attentions during the clinical diagnosis.