Dimeric inhibitors of human salivary alpha-amylase from emmer (Triticum dicoccon Schrank) seeds |
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Authors: | Fontanini Debora Capocchi Antonella Muccilli Vera Saviozzi Franco Cunsolo Vincenzo Saletti Rosaria Foti Salvatore Galleschi Luciano |
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Affiliation: | Department of Biology, University of Pisa, Via L. Ghini 5, 56126 Pisa, Italy. dfontanini@biologia.unipi.it |
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Abstract: | The proteins belonging to the cereal trypsin/alpha-amylase inhibitor family are abundant water/salt-soluble flour proteins active against alpha-amylases from several seed parasites and pests and inactive against endogenous alpha-amylases. Three alpha-amylase inhibitor families have been described in cereals that vary in size and are differently expressed among Triticeae seeds. The present work investigates the presence of human salivary alpha-amylase inhibitors in emmer (Triticum dicoccon Schrank) flour. The isolation was obtained by a series of chromatography steps, and the purification progress was monitored through the inhibition of human salivary alpha-amylase activity. The purified fraction was subjected to protein sequencing by tandem mass spectrometry (MSMS) of the tryptic digests obtained after the sample separation on 2-DE. MSMS data indicated that the emmer alpha-amylase inhibitory fraction was composed of two newly identified proteins [emmer dimeric inhibitor 1 (EDI-1) and emmer dimeric inhibitor 2 (EDI-2)] sharing very high identity levels with related proteins from Triticum aestivum. |
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