9
Casein are phosphorylated proteins and the phosphate group is attached to amino acid of casein
EXPLANATION
Casein Fractionation
- Post-Translational Phosphorylation Site on Caseins:
- Phosphoserine Residues:
- Caseins ($\alpha_{s1}, \alpha_{s2}, \beta$-casein) are phosphoproteins where orthophosphate groups are monoesterified to the hydroxyl group of serine residues (as O-phosphoserine).
- Phosphorylation occurs within the recognition sequence motif $\text{Ser-X-Glu/SerP}$.
- These phosphoserine clusters bind calcium ions, forming nanoclusters of colloidal calcium phosphate that stabilize casein micelles.
- Conclusion: Serine (Option 3).
Correct option: (3) Serine
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