PMID: 8600979Mar 15, 1996Paper

Plant and human neutrophil oxidative burst complexes contain immunologically related proteins

Biochimica Et Biophysica Acta
S C DwyerT L Leto

Abstract

Generation of the microbicidal oxidative burst in human neutrophils requires participation of four proteins, a membrane bound flavocytochrome beta-558, two soluble proteins termed p47-phox and p67-phox, and the Ras-related GTPase Rac. Because plant cells exposed to pathogens produce a similar oxidative burst, we have looked for similarities between the oxidase complexes of the two systems. Antibodies against human neutrophil p47-phox and p67-phox were used to immunoblot cell extracts from several plant cell lines and were found to cross-react with proteins of the same molecular weight. Furthermore, plant cell lines not previously shown to produce an oxidative burst, yet found to express these immunoreactive proteins, rapidly generated hydrogen peroxide in response to elicitation. Finally, diphenylene iodonium (DPI) and alpha-naphthol, known specific inhibitors of the NADPH oxidase in neutrophils, also inhibited the oxidative burst in soybean cell suspensions with similar Ki values (about 15 microM and 30 microM respectively). These results provide evidence for involvement of proteins related to the neutrophil oxidase complex in the defense-related oxidative burst of plants.

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