[No authors listed]
Porcine beta-casein was isolated by chromatography on DEAE-cellulose. The protein had a molecular weight of 24 900 as determined by gel filtration on Sephadex G-100 in guanidine-HCl. Its amino acid composition differed from bovine beta-casein especia-ly in respect to serine, alanine and leucine. In common with bovine beta-casein the N-terminal amino acid was arginine; the C-terminal was either alanine or valine, while the C-terminal of bovine beta-casein is valine. At any temperature porcine beta-casein was more sensitive to Ca2+ than bovine beta-casein, while at a fixed Ca2+ concentration porcine beta-casein aggregated at a lower temperature than bovine beta-casein. Porcine beta-casein was susceptible to hydrolysis by calf chymosin but the proteolytic specificity differed from that of calf chymosin on bovine beta-casein.
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