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The action of rennets on the caseins: I. Rennin action on β-casein-B in solution

Published online by Cambridge University Press:  01 June 2009

L. K. Creamer ,
O. E. Mills  and
E. L. Richards
L. K. Creamer
Affiliation:
New Zealand Dairy Research Institute, Palmerston North, New Zealand
O. E. Mills
Affiliation:
New Zealand Dairy Research Institute, Palmerston North, New Zealand
E. L. Richards
Affiliation:
Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand
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Summary

A study of the hydrolysis of β-casein-B by crystalline rennin or rennet extract at pH 6·5, using a disk electrophoresis technique, showed that 3 bonds in β-casein are appreciably more sensitive than the others to rennin proteolysis, and that these bonds are probably located near the C-terminus of the protein. The most susceptible bond is hydrolysed, at 10°C, about 200 times faster than any other bond, whilst at 37°C it is hydrolysed 60 times faster. A study of the hydrolysis of this bond showed that its rate of hydrolysis at 37°C and pH 6·5 is decreased by either increased ionic strength or increased calcium ion concentration at constant ionic strength. Conformational changes in the substrate are probably responsible for these effects.

Type
Original Articles
Information
Journal of Dairy Research , Volume 38 , Issue 3 , October 1971 , pp. 269 - 280
Copyright
Copyright © Proprietors of Journal of Dairy Research 1971

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