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Microbial Production of Recombinant Rennet: Recent Developments
Abstract
Rennet, traditionally obtained from calves, is non-vegeterian and unethical due to the slaughter of unweaned animals. Chymosin is highly specific to the Phe105-Met106 bond of κ-casein and has low proteolytic activity. Microbial aspartic proteases can partly replace chymosin. However, recombinant DNA technology has allowed chymosin itself to be produced by bacteria, yeast, and molds. Not only rennet from calf, but from animals like goat kid, lamb, buffalo, camel, and others can be used in cheesemaking. Chymosins of these animals can be cloned and successfully expressed in microorganisms and can be employed in the production of novel as well as traditional cheese products from the milk of camel, goat, and even horse and donkey. This chapter outlines the recombinant DNA techniques applied over the past few years to improve the microbial production of recombinant rennet, from animals and plants.
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