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A high affinity folate binding protein in umbilical cord serum
Scandinavian Journal of Clinical and Laboratory Investigation
|October 1, 1980
Summary
Researchers identified high-affinity folate binding proteins in umbilical cord serum, distinct from albumin. Their exact physiological role remains unclear, but they may relate to intracellular folate regulation.
Area of Science:
- Biochemistry
- Molecular Biology
- Clinical Chemistry
Background:
- Folate is essential for cellular processes.
- Understanding folate binding proteins in serum is crucial for diagnostics and therapeutics.
Purpose of the Study:
- To characterize folate binding proteins in umbilical cord serum.
- To differentiate high-affinity and low-affinity folate binding sites.
Main Methods:
- Equilibrium dialysis with radiolabeled [3H] folate.
- Scatchard analysis to determine binding affinities.
- Ion-exchange chromatography (DEAE-Sepharose Cl-6B) and gel filtration for protein characterization.
Main Results:
- Two distinct folate binding sites were identified: high-affinity (Kass = 9.10(10)1/mol) and low-affinity.
- High-affinity binding was inhibited by methotrexate and associated with a 35,000 molecular weight protein.
- Low-affinity binding was primarily linked to albumin and predominated at higher folate concentrations.
Conclusions:
- Umbilical cord serum contains a high-affinity folate binding protein separate from albumin.
- The physiological significance of this high-affinity binder is currently unknown but may involve intracellular folate metabolism.
- Further research is needed to elucidate the role of this protein in folate homeostasis.