期刊
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
卷 55, 期 11, 页码 1491-1502出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10408398.2012.700340
关键词
Soybean globulins; 11S and 7S globulin; -Conglycinin; basic 7S globulin; hypo-cholesterolemic effect
资金
- University Grants Commission
Storage proteins of soybean mostly consist of globulins, which are classified according to their sedimentation coefficient. Among 4 major types: 2S, 7S, 11S, and 15S of globulins, 7S and 11S constitute major fraction. The 11S fraction consists only of glycinin and 7S fraction majorly consists of -conglycinin, small amounts of -conglycinin and basic 7S globulin (Bg7S). Glycinin exist as a hexamer while -conglycinin as a trimer and Bg7S as a tetramer. Glycinin subunits are coded by 5 genes of a family, whereas about 15 genes are present for -conglycinin subunits. Bg7S gene is present in four copies in soybean genome. Synthesis of all proteins takes place as a single polypeptide chain, which is cleaved after folding to yield different chains or subunits. Glycinin and -Conglycinin are made for storage purpose. However, Bg7S has potential xylanase inhibition activity and protein kinase activity. Primary structure of Bg7S reveals 12 conserved cysteine residues involved in forming 6 disulfide bonds, which provides appreciable stability to protein. Secondary structure is predominately rich in -sheets with few alpha helices. Bg7S shares structural similarity with various aspartic-proteases. In this review, our aim is to discuss sequence, structure, and function of various globulins present in Glycine max.
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