Abstract
Proteolytic and clotting activities of bovine pepsin A with respect to its degree of phosphorylation were studied on various substrates. The occurence of phosphate group(s) on bovine pepsin A more or less strongly affects its enzymic properties according to the substrate and its environment. This is particularly obvious as far as κ-casein is concerned. The specific flocculating activity of unphosphorylated (fA 0) as well as dephosphorylated (treated with potato) acid phosphatase) bovine pepsin A, determined on a 0.2% κ-casein solution, is significantly higher than that observed with phosphorylated pepsins, especially after κ-casein was treated with α- d. N-acetyl galactosaminyl oligosaccharidase, while specific milk clotting activity remains unchanged regardless to the level of phosphorylation of bovine pepsin A is.
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