Partial purification of proteins from pea leaflets that inhibit Ascochyta pisi endopolygalacturonase

Hoffman, RM and Turner, JG (1982) Partial purification of proteins from pea leaflets that inhibit Ascochyta pisi endopolygalacturonase. Physiological Plant Pathology, 20 (2). pp. 173-187.

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Ascochyta pisi produced polygalacturonase, “polymethylgalacturonase”, arabanase, ß-glucosidase, a-galactosidase and ß-xylosidase when cultured on washed cell walls isolated from pea leaflets. Polygalacturonase accounted for 78% of the detected enzyme activity and was separated into an exo- and endopolygalacturonase by cation exchange chromatography. The partially purified endopolygalacturonase, mol. wt=48 000, was inhibited by a protein, mol. wt=42 000, extracted from pea (Pisum sativum) leaflets. Of the other enzymes, only “polymethylgalacturonase” was inhibited by this protein. Between 70 and 90% of the endopolygalacturonase inhibitor in pea leaflets occurred as a soluble protein and the remainder was bound to the cell wall. The soluble and cell wall bound forms of the inhibitor were distinguishable by cation exchange chromatography. It was calculated that sufficient soluble inhibitor was present in the tissue to protect it from significant amounts of A. pisi endopolygalacturonase.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
University of East Anglia > Faculty of Science > Research Groups > Plant Sciences
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Depositing User: Deborah Clemitshaw
Date Deposited: 13 Sep 2011 09:47
Last Modified: 25 Jul 2018 08:24
DOI: 10.1016/0048-4059(82)90083-2

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