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Related Experiment Videos

Oestriol binding to plasma proteins.

V Moutsatsou1, R E Oakey

  • 1Department of Chemical Pathology, School of Medicine, University of Leeds, England.

Journal of Steroid Biochemistry
|March 1, 1988
PubMed
Summary

Human pregnancy plasma binds oestriol more effectively than albumin. A specific glycoprotein, likely sex hormone-binding globulin, binds oestriol but plays a minor role in its transport.

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Area of Science:

  • Endocrinology
  • Biochemistry
  • Protein Chemistry

Background:

  • Oestriol, a key estrogen during pregnancy, circulates in maternal plasma.
  • Understanding oestriol binding proteins is crucial for comprehending its physiological transport and availability.

Purpose of the Study:

  • To investigate the binding characteristics of oestriol in human pregnancy plasma.
  • To identify and characterize the plasma protein responsible for oestriol binding.

Main Methods:

  • Simple diffusion experiments to assess oestriol retention by plasma and albumin.
  • Isolation of oestriol-binding glycoprotein using Concanavalin A affinity chromatography.
  • Determination of binding affinity (Ka) and free energy of binding.
  • Competition assays to identify the binding protein.

Main Results:

  • Oestriol showed higher retention in pregnancy plasma compared to albumin solutions.
  • A glycoprotein was isolated that binds oestriol with high affinity (Ka = 6 x 10^6 L/mol at 4°C).
  • Binding free energy at 37°C was -38 kJ/mol, and competition experiments suggested it is sex hormone-binding globulin.
  • Distribution analysis showed glycoprotein-bound oestriol at 7.8%, albumin-bound at 78.6%, and unbound at 13.6%.

Conclusions:

  • Human pregnancy plasma contains a high-affinity oestriol-binding glycoprotein, likely sex hormone-binding globulin.
  • Despite high affinity, this glycoprotein's contribution to oestriol transport appears minimal due to its low proportion of bound oestriol.
  • Albumin remains the primary carrier for oestriol in human pregnancy plasma.

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