Abstract
Glu-D1y12.K as a novel y-type subunit was found in HMW-GSs encoded at the Glu-D1 locus in the JB20, which a Korean wheat line from F9 lines crossed by Keumkang with Glu-D1d and Chinese Spring (CS) with Glu-D1a alleles. This novel subunit shows faster electrophoretic mobility and lower molecular weight than Dy12 subunit on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The result of linear ion-trap and Fourier-transform mass spectrometry (LTQ-FT-MS) based on two-dimensional electrophoresis (2-DE) showed that the Dy12.K subunit has high similarity against protein ID: P08488 (GLT3_WHEAT) as ‘Glutenin, high molecular weight subunit 12’ form UniProtKB. The gene of the Glu-1Dy12.K subunit is composed of 1962 nucleotide base pairs containing open reading frame (ORF) as 652 amino acids corresponding to about 70.1 kDa. It has four indels (36 bp insertions: two repeated 18 and 24 bp deletion: two deletions with 6 + 18 bp) and 21 SNPs compared to Glu-1Dy10 (GI: 164457872 in NCBI), and one deletion (18 bp) and three SNPs compared to Glu-1Dy12 (GI: 1036031968) by DNA markers. Consequentially, in comparison with Dy10, 13 SNPs were non-synonymous SNPs and eight SNPs were synonymous SNPs of 21 SNPs. In comparison with Dy12, only one SNP was non-synonymous SNP of three SNPs. Furthermore, the deduced peptide sequences as ‘TGQGQQ’ corresponding to ‘AACAGGACAAGGGCAACA’ are deleted only in the Dy12.K subunit.
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