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High-affinity folate binding in human liver membranes.

J Holm1, S I Hansen, M Høier-Madsen

  • 1Department of Clinical Chemistry, Central Hospital Nykøbing Falster, Denmark.

Bioscience Reports
|June 1, 1991
PubMed
Summary

This study investigated folate binding in human liver membranes, revealing specific binding characteristics and identifying two molecular forms of the folate binding protein. These findings contribute to understanding folate transport and metabolism.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Folate binding proteins play crucial roles in folate transport and cellular metabolism.
  • Understanding the molecular characteristics of these proteins is essential for comprehending folate homeostasis.

Purpose of the Study:

  • To characterize the high-affinity binding of folate in human liver membranes.
  • To identify and analyze the molecular forms of the folate binding protein present in human liver.

Main Methods:

  • Solubilization of human liver membranes using Triton X-100.
  • High-affinity binding assays using 3H-folate.
  • Chromatographic separation using Ultrogel AcA 44.
  • Molecular weight determination via SDS-PAGE and immunoblotting.

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Main Results:

  • Specific folate binding exhibited characteristics of apparent positive cooperativity.
  • Chromatography revealed a major 100 kDa peak and a minor 25 kDa peak of folate binding activity.
  • SDS-PAGE and immunoblotting confirmed identical molecular weights for both peaks, suggesting distinct molecular forms.

Conclusions:

  • Human liver membranes possess specific folate binding sites with cooperative characteristics.
  • Two distinct molecular forms of the folate binding protein exist in human liver, with the 100 kDa form potentially being membrane-associated.