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Selenium and the methionine sulfoxide reductase system.

Derek B Oien¹, Jackob Moskovitz

¹Department of Pharmacology and Toxicology, School of Pharmacy, University of Kansas, Lawrence, KS 66045, USA. moskovij@ku.edu

Molecules (Basel, Switzerland)

|July 28, 2009

Summary

Selenium deficiency impacts methionine sulfoxide reductase (Msr) proteins, crucial for enzymatic function. This study examines selenium

Area of Science:

Biochemistry and Molecular Biology
Nutritional Science
Enzymology

Background:

Selenium is essential for synthesizing selenocysteine residues, vital for selenoprotein enzymatic activity.
The methionine sulfoxide reductase (Msr) system, comprising MsrA and MsrB, repairs oxidative damage by reducing methionine sulfoxide (MetO) to methionine.
MsrA reduces the S-form, while the selenoprotein MsrB (MsrB1) reduces the R-form of MetO.

Purpose of the Study:

To investigate the impact of a selenium-deficient (SD) diet on the expression and function of Msr-related proteins.
To analyze selenium levels in the brain, liver, and kidneys of wild-type (WT) and MsrA knockout (MsrA(-)/(-)) mice under SD conditions.
To elucidate the interplay between selenium status and the Msr system's efficiency.

Main Methods:

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Administration of a selenium-deficient (SD) diet to wild-type (WT) and MsrA knockout (MsrA(-)/(-)) mice.
Analysis of Msr-related protein expression and enzymatic function.
Quantification of selenium levels in key organs (brain, liver, kidneys).

Main Results:

The SD diet altered the expression and function of Msr-related proteins in both WT and MsrA(-)/(-) mice.
Significant differences in selenium levels were observed in the brain, liver, and kidneys between WT and MsrA(-)/(-) mice fed an SD diet.
The Msr system's response to selenium deficiency varied depending on the presence of MsrA.

Conclusions:

Dietary selenium levels critically influence the expression and function of the methionine sulfoxide reductase system.
MsrA plays a significant role in the adaptation of the Msr system to selenium deficiency.
Understanding these interactions is crucial for comprehending cellular redox homeostasis and the role of selenium in neurological and metabolic health.