Chemical Communication in a Post-Genomic World (2003) / Chapter Skim
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13 Systemins: A functionally defined family of peptide signals that regulate defensive genes in Solanaceae species
13 Systemins: A functionally defined family of peptide signals that regulate defensive genes in Solanaceae species
Pages 65-68
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From page 65... ...
prosystemin I systemin receptor I plant defense Systemin, the initial peptide signal found in plants, is an intracellular signaling molecule that is synthesized within the amino acid sequence of a 200-aa precursor, called prosystemin (1, 2~. Systemin induces proteinase inhibitor protein synthesis in leaves of young tomato plants when supplied for a few minutes through their cut stems at nanomolar concentrations (14.
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From page 66... ...
The presence of multiple signaling peptides contained in a single preproprecursor is a characteristic of many animal peptide hormones, but the two tobacco systemins provide the first example in plants of a peptide hormone precursor harboring multiple peptide signals. Although tobacco does not use a tomato systemin homolog for systemic wound signaling, TobHypSys I and II appear to serve roles in defense signaling.
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From page 67... ...
I~he three tomato peptides exhibit similar biological activities as tomato systemin, indicating that they are defense signals (22~. They all exhibit similar specific activities in the alkalinization assays, and all are effective inducers of proteinase inhibitors I and II synthesis when supplied to young tomato plants.
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From page 68... ...
(1999) Plant Cell 11, 1-13.
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