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On the role of peripheral interactions in specificity of chymosin.

Chymosin is distinguished by a high level of milk-clotting activity which is the consequence of the specific cleavage of the Phe(105)-Met(106) bond of kappa-casein. Based on modelling considerations it was proposed that milk-clotting activity of chymosin is associated with electrostatic interactions of a charged segment His-Pro-His-Pro-His (98-102) of casein and the outer loop of the enzyme containing Glu-244,Asp-246 and Asp-248.