Question:
Which of the following is a phospho-protein?
Which of the following is a phospho-protein?
Show Hint
Conjugated Proteins:
Phosphoprotein = Casein, Vitellin.
Glycoprotein = Immunoglobulins, Mucin.
Lipoprotein = Chylomicrons, VLDL, LDL.
Phosphoprotein = Casein, Vitellin.
Glycoprotein = Immunoglobulins, Mucin.
Lipoprotein = Chylomicrons, VLDL, LDL.
Updated On: Sep 4, 2026
- Immunoglobulin G
- Albumin
- Casein
- Beta-lipoprotein
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Conjugated proteins contain non-protein prosthetic groups (phosphate, carbohydrate, lipid, or heme) covalently attached to the polypeptide chain.
Step 2: Detailed Explanation:
Evaluating the conjugated proteins:
1. Casein: The major phosphoprotein of milk (constituting $\approx 80\%$ of bovine milk protein), containing serine and threonine residues post-translationally esterified with phosphate groups (forming phosphoserine clusters that chelate calcium as calcium caseinate micellar complexes).
2. Immunoglobulin G: Glycoprotein.
3. Albumin: Simple globular protein.
4. Beta-lipoprotein: Conjugated lipid-protein complex.
Step 3: Final Answer:
Hence, Casein is a phospho-protein, corresponding to option (C).
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