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On the activity and specificity of cardosin B, a plant proteinase, on ovine caseins

Title
On the activity and specificity of cardosin B, a plant proteinase, on ovine caseins
Type
Article in International Scientific Journal
Year
1999
Authors
Silva, SV
(Author)
Other
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F. Xavier Malcata
(Author)
Other
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Journal
Title: Food ChemistryImported from Authenticus Search for Journal Publications
Vol. 67
Pages: 373-378
ISSN: 0308-8146
Publisher: Elsevier
Other information
Authenticus ID: P-001-2N5
Abstract (EN): The proteolytic activity of cardosin B, an aspartic proteinase from the thistle, Cynara cardunculus, on ovine alpha(s)-caseins and beta-caseins (independently or present together in sodium caseinate) was followed by urea polyacrylamide gel electrophoresis and reversed phase high performance liquid chromatography. This enzyme degraded both types of caseins, but not to the same degree. In sodium-caseinate, by 10 h at 30 degrees C, alpha(s)-caseins were more susceptible to proteolysis by cardosin B than beta-casein whereas, in isolated form, the reverse was observed. Sequencing of the peptides produced by hydrolysis of Na-caseinate showed that the major cleavage sites in alpha 1-casein were Leu156-Asp157 and Trp164-Tyr165 whereas, in beta-casein, they were Leu127-Thr128, Leu165-Ser166 and Leu90-Tyr191. The bonds Trp164-Tyr165 and Leu165-Ser166 were the most susceptible to cardosin B when this enzyme acted upon isolated alpha(s1)- and beta-casein, respectively.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 6
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