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The vitamin K dependent reaction.

B C Johnson1

  • 1Oklahoma Medical Research Foundation, Oklahoma City 73104.

Journal of Chromatography
|May 25, 1988
PubMed
Summary
This summary is machine-generated.

Vitamin K (2-methyl-1,4-naphthoquinones) is crucial for protein modification. Its hydroquinone form, not the quinone, acts with oxygen in a mixed-function oxidation, involving free radicals, to carboxylate glutamate residues.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nutritional Science

Background:

  • Vitamin K, a group of 2-methyl-1,4-naphthoquinones, is essential for post-translational modification of proteins.
  • This modification, gamma-carboxylation of glutamyl residues, is vital for the function of various precursor polypeptides.

Purpose of the Study:

  • To elucidate the specific mechanism of the vitamin K-dependent carboxylation reaction.
  • To investigate the role of the quinone versus hydroquinone forms of vitamin K in this process.
  • To compare the vitamin K-dependent oxidation to other known mixed-function oxidation systems.

Main Methods:

  • The study focuses on the biochemical requirements of vitamin K-dependent gamma-carboxylation.
  • It examines the necessity of the hydroquinone form and molecular oxygen for the reaction.

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  • Compares the reaction mechanism to other established mixed-function oxidants and uses spin-trapping agents to probe for radical intermediates.

    • Main Results:

    • The vitamin K-dependent carboxylation requires the hydroquinone form, not the quinone form, of vitamin K.
    • The reaction is a mixed-function oxidation involving molecular oxygen and a reducing compound.
    • Evidence suggests a free radical mechanism, supported by inhibition studies with spin-trapping agents.

    Conclusions:

    • The vitamin K-dependent gamma-carboxylation of glutamyl residues involves a mixed-function oxidation mechanism.
    • This process utilizes the hydroquinone form of vitamin K and molecular oxygen, likely proceeding through a free radical intermediate.
    • The mechanism shares similarities with other biological mixed-function oxidation systems, such as those involving cytochrome P450.