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Title

Cloning of the Authentic Bovine Gene Encoding Pepsinogen A and Its Expression in Microbial Cells

AuthorsMuñoz, Rosario ; García, José Luis ; Carrascosa, Alfonso V. ; González García, Ramón
Issue DateMay-2004
PublisherAmerican Society for Microbiology
CitationApplied and Environmental Microbiology 70(5): 2588-2595 (2004)
AbstractBovine pepsin is the second major proteolytic activity of rennet obtained from young calves and is the main protease when it is extracted from adult animals, and it is well recognized that the proteolytic specificity of this enzyme improves the sensory properties of cheese during maturation. Pepsin is synthesized as an inactive precursor, pepsinogen, which is autocatalytically activated at the pH of calf abomasum. A cDNA coding for bovine pepsin was assembled by fusing the cDNA fragments from two different bovine expressed sequence tag libraries to synthetic DNA sequences based on the previously described N-terminal sequence of pepsinogen. The sequence of this cDNA clearly differs from the previously described partial bovine pepsinogen sequences, which actually are rabbit pepsinogen sequences. By cloning this cDNA in different vectors we produced functional bovine pepsinogen in Escherichia coli and Saccharomyces cerevisiae. The recombinant pepsinogen is activated by low pH, and the resulting mature pepsin has milk-clotting activity. Moreover, the mature enzyme generates digestion profiles with -, ß-, or -casein indistinguishable from those obtained with a natural pepsin preparation. The potential applications of this recombinant enzyme include cheese making and bioactive peptide production. One remarkable advantage of the recombinant enzyme for food applications is that there is no risk of transmission of bovine spongiform encephalopathy.
Publisher version (URL)http://dx.doi.org/10.1128/AEM.70.5.2588-2595.2004
URIhttp://hdl.handle.net/10261/41518
DOI10.1128/AEM.70.5.2588-2595.2004
ISSN0099-2240
E-ISSN1098-5336
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