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Food Science and Technology QUESTION #5910
Question 1
The \(\alpha_{s1}\)-casein phosphoserine residues are significant because:
  • Casein is not phosphorylated; calcium binds via carboxyl groups only
  • \(\alpha_{s1}\)-casein has \(8\) phosphoserine residues that bind calcium and form the core of casein micelles; phosphorylation is essential for CCP bridging✔️
  • Casein is phosphorylated only at tyrosine residues
  • \(\beta\)-casein carries no phosphate groups
Correct Answer Explanation
\(\alpha_{s1}\)-casein has \(8\) phosphoserine residues clustered in specific phosphopeptide sequences. These serine phosphate groups are essential for binding colloidal calcium phosphate (CCP) and forming calcium bridges between casein molecules, critical for micelle architecture and stability.