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. 1984 Jun;3(6):1409–1415. doi: 10.1002/j.1460-2075.1984.tb01985.x

Developmentally regulated plant genes: the nucleotide sequence of a wheat gliadin genomic clone.

J A Rafalski, K Scheets, M Metzler, D M Peterson, C Hedgcoth, D G Söll
PMCID: PMC557531  PMID: 6204862

Abstract

Gliadins, the major wheat seed storage proteins, are encoded by a multigene family. Northern blot analysis shows that gliadin genes are transcribed in endosperm tissue into two classes of poly(A)+ mRNA, 1400 bases (class I) and 1600 bases (class II) in length. Using poly(A)+ RNA from developing wheat endosperm we constructed a cDNA library from which a number of clones coding for alpha/beta and gamma gliadins were identified by hybrid-selected mRNA translation and DNA sequencing. These cDNA clones were used as probes for the isolation of genomic gliadin clones from a wheat genomic library. One such genomic clone was characterized in detail and its DNA sequence determined. It contains a gene for a 33-kd alpha/beta gliadin protein (a 20 amino acid signal peptide and a 266 amino acid mature protein) which is very rich in glutamine (33.8%) and proline (15.4%). The gene sequence does not contain introns. A typical eukaryotic promoter sequence is present at -104 (relative to the translation initiation codon) and there are two normal polyadenylation signals 77 and 134 bases downstream from the translation termination codon. The coding sequence contains some internal sequence repetition, and is highly homologous to several alpha/beta gliadin cDNA clones. Homology to a gamma-gliadin cDNA clone is low, and there is no homology with known glutenin or zein cDNA sequences.

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Selected References

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