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Synergistic Enhancement of the Antifungal Activity of Wheat and Barley Thionins by Radish and Oilseed Rape 2S Albumins and by Barley Trypsin Inhibitors.
Plant Physiology 1993 December
Although thionins and 2S albumins are generally considered as storage proteins, both classes of seed proteins are known to inhibit the growth of pathogenic fungi. We have now found that the wheat (Triticum aestivum L.) or barley (Hordeum vulgare L.) thionin concentration required for 50% inhibition of fungal growth is lowered 2- to 73-fold when combined with 2S albumins (at sub- or noninhibitory concentrations) from radish (Raphanus sativus L.) or oilseed rape (Brassica napus L.). Furthermore, the thionin antifungal activity is synergistically enhanced (2- to 33-fold) by either the small subunit or the large subunit of the radish 2S albumins. Three other 2S albumin-like proteins, the barley trypsin inhibitor and two barley Bowman-Birk-type trypsin inhibitor isoforms, also act synergistically with the thionins (2- to 55-fold). The synergistic activity of thionins combined with 2S albumins is restricted to filamentous fungi and to some Gram-positive bacteria, whereas Gram-negative bacteria, yeast, cultured human cells, and erythrocytes do not show an increased sensitivity to thionin/albumin combinations (relative to the sensitivity to the thionins alone). Scanning electron microscopy and measurement of K+ leakage from fungal hyphae revealed that 2S albumins have the same mode of action as thionins, namely the permeabilization of the hyphal plasmalemma. Moreover, 2S albumins and thionins act synergistically in their ability to permeabilize fungal membranes.
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