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Related Experiment Videos

Cofactor role for 10-formyldihydrofolic acid

J E Baggott1, G L Johanning, K E Branham

  • 1Department of Nutrition Sciences, University of Alabama, Birmingham 35294, USA.

The Biochemical Journal
|June 15, 1995
PubMed
Summary

This study successfully synthesized and characterized 10-Formyl-7,8-dihydrofolic acid (10-HCO-H2folate), demonstrating its distinct spectral properties and enzymatic utility. The research highlights its kinetic advantage over 10-formyl-5,6,7,8-tetrahydrofolic acid (10-HCO-H4folate) in specific transformylase reactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Organic Chemistry

Background:

  • Folate derivatives are crucial cofactors in one-carbon metabolism.
  • 10-formyl-5,6,7,8-tetrahydrofolic acid (10-HCO-H4folate) is a known intermediate.
  • The precise structure and function of 10-Formyl-7,8-dihydrofolic acid (10-HCO-H2folate) require detailed characterization.

Purpose of the Study:

  • To synthesize and unequivocally characterize 10-Formyl-7,8-dihydrofolic acid (10-HCO-H2folate).
  • To compare the spectral properties of the synthesized 10-HCO-H2folate with other folate forms.
  • To investigate the enzymatic activity and kinetic parameters of 10-HCO-H2folate with specific transformylases.

Main Methods:

  • Controlled air oxidation of 10-formyl-5,6,7,8-tetrahydrofolic acid (10-HCO-H4folate).

Related Experiment Videos

  • UV-Vis spectroscopy at different pH values.
  • Proton Nuclear Magnetic Resonance (1H-NMR) spectroscopy.
  • Enzymatic assays using Jurkat-cell and chicken liver aminoimidazolecarboxamide ribonucleotide transformylase (AICAR T'ase).

    • Main Results:

    • Authentic 10-HCO-H2folate was prepared and characterized by UV-Vis and 1H-NMR spectroscopy, showing distinct spectral signatures.
    • The preparation was confirmed to be free from significant contamination by other folate derivatives.
    • 10-HCO-H2folate demonstrated utilization by Jurkat-cell and chicken liver AICAR T'ase, producing H2folate.
    • A significant kinetic advantage (approx. 5-fold difference in K(m)) of 10-HCO-H2folate over 10-HCO-H4folate was observed for Jurkat-cell and rat bone marrow AICAR T'ase.

    Conclusions:

    • The synthesized 10-HCO-H2folate is authentic and spectrally distinct.
    • 10-HCO-H2folate is an active substrate for AICAR T'ase, exhibiting favorable kinetics compared to 10-HCO-H4folate.
    • These findings support the potential in vivo existence and role of 10-HCO-H2folate in mammalian one-carbon metabolism.