Aspects of this topic are discussed in the following places at Britannica.
...specific glutamic acid residues in the protein are changed by an enzyme-mediated reaction to form a modified glutamic acid known as γ-carboxyglutamic acid. This enzyme reaction, known as γ-carboxylation, requires vitamin K as a cofactor. γ-Carboxyglutamic acid is a unique amino acid that binds to calcium. In the protein, γ-carboxyglutamic acids form the...
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