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The purification and characterization of homologous high molecular weight storage proteins from grain of wheat, rye and barley

The purification and characterization of homologous high molecular weight storage proteins from grain of wheat, rye and barley

Tag. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik 62(4): 329-336

Homologous high molecular weight storage prolamins were purified from grain of wheat, rye and barley using combinations of gel filtration, ion-exchange chromatography and preparative isoelectric focusing. Sodium dodecylsulphate polyacrylamide gel electrophoresis showed that the components were single bands with apparent mol.wts. of above 100,000. Molecular weights determined by sedimentation equilibrium ultracentrifugation were considerably lower; 54,700, 67,600 and 69,600 for the components from barley, rye and wheat respectively. Amino acid analysis showed the presence of 13.6 to 16.5 mol% glycine, 29.6 to 34.0 mol% glutamate + glutamine, 11.4 to 13.7 mol% proline and a total of 4.0 to 5.7 mol% basic amino acids. Automated N-terminal amino acid sequencing of the component from wheat showed the presence of cysteine residues at positions 5 and 10, and this is discussed in relation to the possible role of these proteins in the visco-elastic gluten network.

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Accession: 006744485

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PMID: 24270653

DOI: 10.1007/bf00275097

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