NDLI: One of the possible mechanisms for the inhibition effect of Tb(III) on peroxidase activity in horseradish (Armoracia rusticana) treated with Tb(III)

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One of the possible mechanisms for the inhibition effect of Tb(III) on peroxidase activity in horseradish (Armoracia rusticana) treated with Tb(III)

Content Provider	Springer Nature Link
Author	Guo, Shaofen Cao, Rui Lu, Aihua Zhou, Qing Lu, Tianhong Ding, Xiaolan Li, Chaojun Huang, Xiaohua
Copyright Year	2008
Abstract	One of the possible mechanisms for the inhibition effect of Tb(III) on peroxidase activity in horseradish (Armoracia rusticana) treated with Tb(III) was investigated using some biophysical and biochemical methods. Firstly, it was found that a large amount of Tb(III) can be distributed on the cell wall, that some Tb(III) can enter into the horseradish cell, indicating that peroxidase was mainly distributed on cell wall, and thus that Tb(III) would interact with horseradish peroxidase (HRP) in the plant. In addition, peroxidase bioactivity was decreased in the presence of Tb(III). Secondly, a new peroxidase-containing Tb(III) complex (Tb–HRP) was obtained from horseradish after treatment with Tb(III); the molecular mass of Tb–HRP is near 44 kDa and the pI is about 8.80. Thirdly, the electrocatalytic activity of Tb–HRP is much lower than that of HRP obtained from horseradish without treatment with Tb(III). The decrease in the activity of Tb–HRP is due to the destruction (unfolding) of the conformation in Tb–HRP. The planarity of the heme active center in the Tb–HRP molecule was increased and the extent of exposure of Fe(III) in heme was decreased, leading to inhibition of the electron transfer. The microstructure change in Tb–HRP might be the result of the inhibition effect of Tb(III) on peroxidase activity in horseradish.
Starting Page	587
Ending Page	597
Page Count	11
File Format	PDF
ISSN	09498257
Journal	JBIC Journal of Biological Inorganic Chemistry
Volume Number	13
Issue Number	4
e-ISSN	14321327
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-02-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tb(III) Peroxidase Microstructure Inhibition mechanism Microbiology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Inorganic Chemistry

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