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  4. The site of action and substrate of rennin are respectively

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Q. The site of action and substrate of rennin are respectively

AIPMTAIPMT 1994Digestion and Absorption

Solution:

In stomach, rennin acts on casein (milk protein) and converts it into paracasein. In the presence of calcium ions, paracasein is converted into calcium paracaseinate, ultimately leading to milk coagulation
Casein $\xrightarrow{ \text{Rennin} }$ Paracasein $\xrightarrow{ca^{+2}}\underset{\text{ (Milk coagulation).}}{\text{Calcium paracaseinate}}$