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Chromatographic comparisons of peptic digests of individual gliadin proteins

Author:
Bietz, J.A., Huebner, F.R.
Source:
Cereal chemistry 1970 v.47 no.4 pp. 393
ISSN:
0009-0352
Subject:
wheat, wheat gluten, gliadin, proteolysis, pepsin, enzymatic hydrolysis, peptides, amino acid composition, chromatography
Abstract:
Peptide maps of peptic digests of whole Ponca wheat gliadin and its alpha-, beta-, gamma1-, and gamma3-components are similar. Of these proteins, gamma3-gliadin is most different. Peptide maps from alpha-, beta-, and gamma-gliadins from Red Chief and Comance wheat varieties also show many similarities both within each variety and between corresponding components. The 2 gamma-gliadin chromatograms are nearly identical. Definite differences between chromatograms of all components, however, indicate that each protein is unique. Peptide mapping by column chromatography is more sensitive than starch-gel electrophoresis of whole proteins in detecting differences in protein structure. The results support the hypothesis that some amino acid sequences in different gliadin proteins have variable structures but others are the same or very similar. Peptide maps of digests of the reduced and S-aminoethylated proteins suggest that some cysteine residues occur in invariant segments.
Agid:
31223
Handle:
10113/31223