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Title: Studies on interactions between plant secondary metabolites and glutathione transferase using fluorescence quenching method
Authors: Zhang, Xian
Cheng, Xinsheng
Wang, Chuanqin
Xue, Zechun
Yang, Liwen
Xi, Zheng
Keywords: Plant secondary metabolites;Glutathione transferase;Fluorescence quenching;UV-Vis absorption spectroscopy
Issue Date: Apr-2007
Publisher: CSIR
Abstract: The interactions between plant secondary metabolites (tannic acid, rutin, cinnamic acid and catechin) and glutathione transferase (GST) were investigated by fluorescence and UV-Vis absorption spectroscopy. Intrinsic fluorescence of GST was measured by selectively exciting their tryptophan (Trp) residues and quenching constants were determined using the Stern-Volmer equation. The binding affinity was found to be strongest for tannic acid and ranked in the order tannic acid>rutin>cinnamic acid>catechin. The pH values in the range of 6.7-7.9, except for tannic acid, did not affect significantly the affinity of rutin, cinnamic acid and catechin with GST. Results showed that the fluorescence quenching of GST was a static quenching. Fluorescence quenching and UV-Vis absorption spectroscopy suggested that only the tannic acid changed the microenvironment of the Trp residues. Furthermore, the number of binding sites and binding constants at different pH values showed that tannic acid had strongest affinity towards GST and hydrogen bonding played an important role in the affinity between GST and the metabolites.
Page(s): 101-105
ISSN: 0301-1208
Appears in Collections:IJBB Vol.44(2) [April 2007]

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