Sørensen, J. and Palmer, D. S. and Qvist, K. B. and Schiøtt, B. (2011) Initial stage of cheese production: a molecular modeling study of bovine and camel chymosin complexed with peptides from the chymosin-sensitive region of kappa-casein. Journal of Agricultural and Food Chemistry, 59 (10). pp. 5636-5647.Full text not available in this repository. (Request a copy from the Strathclyde author)
Bovine chymosin has long been the preferred enzyme used to coagulate cow's milk, in the initial stage of cheese production, during which it cleaves a specific bond in the milk protein kappa-casein. Recently, camel chymosin has been shown to have a 70% higher clotting activity toward cow's milk and, moreover, to cleave kappa-casein more selectively. Bovine chymosin, on the other hand, is a poor clotting agent toward camel's milk. This paper reports a molecular modeling study aimed at understanding this disparity, based on homology modeling and molecular dynamics simulations using peptide fragments of kappa-casein from cow and camel in both bovine and camel chymosin. The results show that the complex between bovine chymosin and the fragment of camel kappa-casein is indeed less stable in the binding pocket. The results also indicate that this in part may be due to charge repulsion between a lysine residue in bovine chymosin and an arginine residue in the P4 position of camel kappa-casein.
|Keywords:||bovine chymosin, peptides , cheese production, Physics, Agricultural and Biological Sciences(all), Chemistry(all)|
|Subjects:||Science > Physics|
|Department:||Faculty of Science > Physics|
|Depositing user:||Pure Administrator|
|Date Deposited:||16 Apr 2012 11:13|
|Last modified:||07 Jan 2017 01:05|