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Selenoprotein P receptor from rat.

B Gomez1, A L Tappel

  • 1Department of Food Science and Technology, University of California, Davis 95616.

Biochimica Et Biophysica Acta
|February 13, 1989
PubMed
Summary
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Researchers discovered a specific receptor for selenoprotein P, a key selenium-transporting protein in rats. This finding suggests a biological mechanism for selenium uptake and transport in mammals.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Selenoprotein P is a crucial selenocysteine-containing plasma protein in rats.
  • Selenium is an essential trace element vital for various physiological functions.
  • The transport mechanism of selenium within the body is not fully understood.

Purpose of the Study:

  • To investigate the presence and characteristics of a receptor for rat selenoprotein P.
  • To determine the role of selenoprotein P in selenium transport.
  • To explore the distribution and specificity of selenoprotein P binding.

Main Methods:

  • Radioreceptor assay using 75Se-labeled selenoprotein P.
  • Competitive binding assays with rat plasma fractions.
  • Saturation binding studies with rat testis membranes.

Related Experiment Videos

  • pH-dependent binding analysis.

    • Main Results:

    • A specific receptor for selenoprotein P was identified in rat testis, kidney, and liver membranes.
    • Binding was competitive and saturable, indicating high specificity.
    • Optimal binding occurred at pH 4.2.
    • Selenoprotein P-related proteins were found in various plasma sources, suggesting widespread occurrence.

    Conclusions:

    • Selenoprotein P binds to a specific receptor, indicating its role in selenium transport.
    • The identified receptor facilitates the uptake of selenoprotein P, likely influencing selenium homeostasis.
    • The widespread presence of selenoprotein P-related proteins suggests a conserved biological pathway for selenium transport across species.