Summary
The nucleotide and deduced amino acid sequences of a high molecular weight glutenin subunit gene derived from chromosome 1B of bread wheat (Triticum aestivum L.) are reported. The encoded protein corresponds to the y-type subunit 1B9. Comparison of the 5′ upstream untranslated regions of this gene and a previously reported silent y-type gene derived from chromosome 1A showed a deletion of 85 bp in the latter. A sequence present in this region of the 1By 9 gene shows homology with part of the “-300 element” which is conserved in the 5′ upstream regions of other prolamin genes from barley, wheat and maize (Forde BG et al. 1985). It is suggested that the absence of this element is responsible for the lack of expression of the 1Ay gene. Comparison of the derived amino acid sequence with those reported previously for the silent 1Ay gene and the expressed x-type (1Dx2) and y-type (1Dy12) genes derived from chromosome 1D showed that the three y-type proteins are closely related. In contrast the x-type subunit (1Dx2) shows clear differences in the N-terminal region and in the number, type and organisation of repeats in the central repetitive domain.
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Halford, N.G., Forde, J., Anderson, O.D. et al. The nucleotide and deduced amino acid sequences of an HMW glutenin subunit gene from chromosome 1B of bread wheat (Triticum aestivum L.) and comparison with those of genes from chromosomes 1A and 1D. Theoret. Appl. Genetics 75, 117–126 (1987). https://doi.org/10.1007/BF00249151
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DOI: https://doi.org/10.1007/BF00249151