Isolation of a Polygalacturonase-Inhibiting Protein (PGIP) from Wheat

Gabré Kemp; Carl W. Bergmann; Ron Clay; Amie J. Van der Westhuizen; Zacharias A. Pretorius

Isolation of a Polygalacturonase-Inhibiting Protein (PGIP) from Wheat

2003

Gabré Kemp | Carl W. Bergmann | Ron Clay | Amie J. Van der Westhuizen | Zacharias A. Pretorius

Evidence for the presence of a polygalacturonase-inhibiting protein (PGIP) from a monocotyledonous cereal is presented. A 40.3-kDa PGIP that was closely associated with the cell wall was acetone-extracted and purified from wheat (Triticum aestivum L.) leaves and stems. Wheat PGIP exhibited a highly selective inhibitory activity against endopolygalacturonase (EPG) from various fungi. Of nine EPG tested, wheat PGIP only inhibited EPG from Cochliobolus sativus, a pathogen of the tribe Poaceae. A short N-terminal amino acid sequence of wheat PGIP shows no similarity to any other characterized PGIP.

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