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Selenoprotein W: a review.

P D Whanger1

  • 1Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis 97331, USA. phil.whanger@orst.edu

Cellular and Molecular Life Sciences : CMLS
|February 24, 2001
PubMed
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Selenoprotein W (Se-W) exists in multiple forms and shows significant genetic homology across species. Selenium levels influence Se-W, suggesting a potential antioxidant role.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Selenoprotein W (Se-W) is a selenium-containing protein found in various tissues.
  • The precise metabolic function of Se-W remains largely uncharacterized.
  • Previous studies indicated Se-W exists in different molecular forms.

Purpose of the Study:

  • To investigate the structural variations and genetic conservation of Se-W across different species.
  • To explore the influence of selenium on Se-W expression.
  • To gain insights into the potential function of Se-W.

Main Methods:

  • Purification of Se-W from muscle tissues of rats and monkeys.
  • Analysis of Se-W complementary DNA (cDNA) sequences from five species (rats, mice, sheep, human, monkey).

Related Experiment Videos

  • Comparative analysis of nucleotide and amino acid sequences.
  • Studies using muscle and brain tissue cultures to assess selenium's effect on Se-W levels.

    • Main Results:

    • Purified Se-W exhibited multiple forms, differing by the presence of reduced glutathione and/or an unknown 41-Da moiety.
    • TGA was identified at coding position 13 in all studied species; it functions as a stop codon in rodents and sheep, while TAA is the stop codon in primates.
    • High nucleotide sequence homology (80%) and amino acid sequence identity (83%) were observed in the coding regions among the species.
    • Se-W levels were highest in sheep and primate muscles, hearts, and brains, but notably low in rodent hearts.
    • Selenium was found to influence Se-W levels in muscle and brain cell cultures.

    Conclusions:

    • Se-W exhibits conserved structural and genetic features across mammals, with variations in stop codons between rodents and primates.
    • Tissue-specific expression patterns of Se-W were observed, with higher levels in primates and sheep.
    • Selenium is a key factor in regulating Se-W levels.
    • Preliminary evidence suggests Se-W may possess antioxidant properties, although its exact metabolic role requires further investigation.