Hirose M, Kato T, Omori K, Takeuchi M, Yoshikawa M, Sasaki R, Chiba H. Purification and characterization of four components of rat caseins.
BIOCHIMICA ET BIOPHYSICA ACTA 1981;
671:139-45. [PMID:
7326261 DOI:
10.1016/0005-2795(81)90127-6]
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Abstract
Rat casein components (C1-, C3A-, C3B- and C4-casein) were extensively purified from rat milk, and the properties of these proteins were compared with those of other caseins including rat C2-casein. C1-casein was precipitated by a low concentration of CaCl2 (1.5 mM). Both C3A- and C3B-casein were less sensitive to Ca2+ than were C1- and C2-casein, and the presence of 20 mM CaCl2 was required at 37 degrees C for their precipitation. C4-casein was absolutely insensitive to Ca2+. This protein exhibited the ability to stabilize all of the other rat casein components against Ca2+-dependent precipitation. In addition, C4-casein contained sialic acid, galactose and N-acetylgalactosamine. Therefore, C4-casein appears to be a bovine kappa-casein-like protein.
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