Everything about Rennin totally explained
Chymosin (or
rennin) is an
aspartic acid protease enzyme found in
rennet. It is produced by the cow, in the lining of the
abomasum (its fourth stomach).
Bovine chymosin is produced nowadays recombinantly in
E.coli,
Aspergillus niger var awamori, and
K.lactis as alternative resource to the one from the cows.
The gene is found in humans (on
chromosome 1), but it isn't in a functioning form.
Rennin is produced by gastric chief cells in infants to curdle the milk they ingest, allowing a longer residence in the bowels and better absorption.
Enzymatic reaction
It causes
cleavage of a specific linkage, the
peptide bond between
phenylalanine and
methionine in the
K-casein. If this reaction applies to milk, the specific linkage between the
hydrophobic (para-casein) and
hydrophilic (acidic
glycopeptide) group of
casein inside milk would be broken, since they're joined by phenylalanine and methionine. The hydrophobic group would unite together and would form a
3D network to trap the aqueous phase of the milk. The resultant product is
calcium phosphocaseinate.
Due to this reaction, rennin is used to bring about the extensive
precipitation and
curd formation in
cheese making.
Further Information
Get more info on 'Rennin'.
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