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Selenium-containing peroxidases of germinating barley
K Huang1, E Lauridsen, J Clausen
1Department of Chemistry, Huazhong University of Science and Technology, Wuhan, P.R. China.
Biological Trace Element Research
|October 1, 1994
Summary
Researchers identified selenoproteins in barley leaves. These selenium-containing proteins, crucial for plant health, were isolated and characterized using advanced biochemical techniques.
Area of Science:
- Plant Biochemistry
- Biotechnology
- Environmental Science
Background:
- Selenium is an essential trace element for many organisms, playing a role in antioxidant defense.
- Understanding selenium metabolism in plants is crucial for both agricultural productivity and human nutrition.
Purpose of the Study:
- To identify and characterize selenium-binding proteins in barley leaves after exposure to selenite.
- To investigate the molecular weight and peroxidase activity of these selenoproteins.
Main Methods:
- Barley seedlings were exposed to 75Se-selenite.
- Proteins were separated using Sephadex G-150 filtration and DEAE-Sepharose chromatography.
- Polyacrylamide gel electrophoresis and autoradiography were used to identify and characterize selenoproteins.
Main Results:
- Three major protein peaks with peroxidase activity were identified in barley leaves.
- Specific selenoproteins were detected within these peaks, with molecular weights ranging from 29.2 kDa to 128 kDa.
- The 89 kDa protein in Peak I, the 59.6 kDa protein in Peak II, and the 29.2 kDa protein in Peak III were confirmed as selenoproteins.
Conclusions:
- Barley leaves contain multiple selenoproteins with varying molecular weights and peroxidase activities.
- These findings contribute to understanding selenium uptake and metabolism in plants.
- Identification of these selenoproteins could have implications for selenium biofortification strategies.