4.7 Article

Relative abundance and inhibitory distribution of protease inhibitors in potato juice from cv. Elkana

Journal

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 49, Issue 6, Pages 2864-2874

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jf010126v

Keywords

potato; Solanum tuberosum; protease inhibitor; inhibiting activity; trypsin; chymotrypsin

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Protease inhibitors from potato juice of cv. Elkana were purified and quantified. The protease inhibitors represent ca. 50% of the total soluble proteins in potato juice. The protease inhibitors were classified into seven different families: potato inhibitor I (PI-1), potato inhibitor II (PI-2), potato cysteine protease inhibitor (PCPI), potato aspartate protease inhibitor (PAPI), potato Kunitz-type protease inhibitor (PKPI), potato carboxypeptidase inhibitor (PCI), and other serine protease inhibitors. The most abundant families were the PI-2 and PCPI families, representing 22 and 12% of all proteins in potato juice, respectively. Potato protease inhibitors show a broad spectrum of enzyme inhibition. All the families (except PCI) inhibited trypsin and/or chymotrypsin. PI-2 isoforms exhibit 82 and 50% of the total trypsin and chymotrypsin inhibiting activity, respectively. A strong variation within the latter activities was shown within one family and between protease inhibitor families.

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