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Plant Physiol. 1993 Jan;101(1):297-301.

Stimulation of Barley Plasmalemma H+-ATPase by Phytotoxic Peptides from the Fungal Pathogen Rhynchosporium secalis.

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1
Max-Planck-Institut fur Zuchtungsforschung, Department of Biochemistry, Carl-von-Linne-Weg 10, D-5000 Koln 30, Federal Republic of Germany.

Abstract

A small family of necrosis-inducing peptides has been identified as virulence factors of Rhynchosporium secalis, a fungal pathogen of barley (Hordeum vulgare L.) Two members of this family, NIP1 and NIP3, were found to stimulate the phosphohydrolyzing activity of the Mg2+-dependent, K+-stimulated H+-ATPase of plasma membrane vesicles isolated from barley leaves by partitioning in an aqueous two-phase system. Stimulation of enzyme activity was saturated by 10 to 15 [mu]M fungal protein. Another member of the peptide family, NIP2, did not affect the enzyme, indicating that it has a different mode of action.

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