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  • Title: Molecular cloning of 11S globulin and 2S albumin, the two major seed storage proteins in sesame.
    Author: Tai SS, Wu LS, Chen EC, Tzen JT.
    Journal: J Agric Food Chem; 1999 Dec; 47(12):4932-8. PubMed ID: 10606554.
    Abstract:
    Insoluble 11S globulin and soluble 2S albumin, conventionally termed alpha-globulin and beta-globulin, are the two major storage proteins and constitute 80-90% of total seed proteins in sesame. Two full-length cDNA clones were sequenced and deduced to encode sesame 11S globulin and 2S albumin precursors, respectively. Deduced amino acid composition reveals that 2S albumin, but not 11S globulin, is a sulfur-rich protein. Three abundant polypeptides of 50-60 kDa were resolved on SDS-PAGE when seed-purified 11S globulin was prepared in nonreducing conditions. Immunological analysis suggests that these three polypeptides are encoded by homologous genes. Immunodetection on the overexpressed protein of the 11S globulin clone in Escherichia coli indicates that this clone encodes the precursor protein of one of the three purified 11S globulin polypeptides.
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