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Phytochemistry 2006-Feb

Apple polygalacturonase inhibiting protein1 expressed in transgenic tobacco inhibits polygalacturonases from fungal pathogens of apple and the anthracnose pathogen of lupins.

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Krækjan er vistuð á klemmuspjaldið
Dean Oelofse
Ian A Dubery
Riaan Meyer
Melanie S Arendse
Inge Gazendam
Dave K Berger

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Útdráttur

Extracts from apple fruit (cultivar "Granny Smith") inhibited the cell-wall degrading polygalacturonase (PG) activity of Colletotrichum lupini, the causal agent of anthracnose on lupins, as well as Aspergillus niger PG. Southern blot analysis indicated that this cultivar of apple has a small gene family of polygalacturonase inhibiting proteins (pgips), and therefore heterologous expression in transgenic tobacco was used to identify the specific gene product responsible for the inhibitory activity. A previously isolated pgip gene, termed Mdpgip1, was introduced into tobacco (Nicotiana tabacum) by Agrobacterium-mediated transformation. The mature MdPGIP1 protein was purified to apparent homogeneity from tobacco leaves by high salt extraction, clarification by DEAE-Sepharose and cation exchange HPLC. Purified MdPGIP1 inhibited PGs from C. lupini and PGs from two economically important pathogens of apple trees, Botryosphaeria obtusa and Diaporthe ambigua. It did not inhibit the A. niger PG, which was in contrast to the apple fruit extract used in this study. We conclude that there are at least two active PGIPs expressed in apple, which differ in their charge properties and ability to inhibit A. niger PG.

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