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Contributo in rivista
Tipo: Articolo in rivista
Titolo: Proteomics of gluten: mapping of subunit 1 Ax2* in Cheyenne cultivar by matrix-assisted laser desorption/ionization.
Anno di pubblicazione: 2001
Autori: Cozzolino R; Di Giorgi S; Fisichella S; Garozzo D; Lafiandra D; Palermo A
Affiliazioni autori: CNR Institute for Chemistry and Technology of Polymeric Materials, 6 V.le A. Doria, 95125 Catania, Italy Department of Chemical Sciences, 6 V.le A. Doria, 95125 Catania, Italy Department of Agrobiology and Agrochemistry, Via S.C. De Lellis, 01100 Viterbo, Italy
Abstract: This paper reports results on the verification of the 1Ax2* high molecular weight glutenin subunit sequence in Cheyenne cultivar. The gene sequence of the protein is known but recently some text changes have been made, and furthermore until now no characterization of post-translational modifications has been reported. The two published sequences, named I and II, differ in four residues at positions 23, 208, 475, and 611. The first sequence contains 20 Arg and 6 Lys residues, producing 26 tryptic fragments, since the Arg(109)-Pro(110) bond is generally not cleaved by trypsin. The second sequence contains 19 Arg and 6 Lys residues, producing 25 tryptic peptides, again because of the Arg(109)-Pro(110) bond. Both sequences generate two cyanogen bromide fragments. Matrix-assisted laser desorption/ionization analysis of the tryptic digest of the high-MW glutenin subunit 1Ax2* resulted in the identification of 24 out of the 26 expected peptides for sequence I, a sequence coverage of 99.5%. These results were sufficient to rule out sequence II and any protein glycosylation and any other post-translational modifications to within the detection limits of the method. It was found that the choice of matrix considerably influenced the sequence coverage in peptide mapping.
RCM. Rapid communications in mass spectrometry
Allegati: Proteomics of gluten: mapping of subunit 1 Ax2* in Cheyenne cultivar by matrix-assisted laser desorption/ionization.
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