KROK 1 Stomatology 2016 – Question 170 · KROK (Dentistry)
Calcification of dental tissues is significantly influenced by osteocalcin protein that can bind calcium ions due to the presence of the following modified amino acid residues in the polypeptide chain:
- A. γ-Carboxyglutamic acid
- B. Alanine
- C. γ-Aminobutyric acid
- D. Carboxyasparagine
- E. δ-Aminopropionic acid
Hint
Think about the vitamin K-dependent post-translational modification that adds an extra carboxyl group to certain residues, creating calcium-binding sites.
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