High molecular wheat glutelin subunit, genes encoding same and use thereof

The present invention discloses one kind of high molecular weight wheat gluten subunit and its coding gene and application. The high molecular weight wheat gluten subunit is protein with the SEQ ID No. 2 amino acid residue sequence in the sequence list or the SEQ ID No. 2 derived protein with one or several substituted, deleted or added amino acid residues and with the same activity as residue sequence of SEQ ID No. 2. The coding gene of the high molecular weight wheat gluten subunit is one of the following nucleotide sequences: 1) the DNA sequence of SEQ ID No. 1 in the sequence list; 2) the DNA sequence of SEQ ID No. 3 in the sequence list; 3) polynucleotides coding the protein sequence of SEQ ID No. 1 in the sequence list; and 4) the DNA sequence with over 90 % homology with the DNA sequence limited by SEQ ID No. 1 or SEQ ID No. 3 and coding the same functional protein. The present invention may find its wide application in transgenic breeding of grains, especially wheat.