2S-Proteins are present in seeds of dicot plants
2S-Proteins are also widely distributed storage proteins. They represent a heterogeneous group of proteins, of which the sole definition is their sedi-mentation coefficient of about 2 Svedberg (S). Structural investigations have revealed that most 2S-proteins have a related structure and therefore possibly derive, along with the prolamins, from a common ancestor pro-tein. Napin, the predominant storage protein in rape seed, is an example of a 2S-protein. This protein is of substantial economic importance since, after the oil has been extracted, the remainder of the rape seed is used as fodder. Napin and other related 2S-proteins consist of two relatively small polypeptide chains of 9 kDa and 12 kDa, which are linked by S-S bridges. So far, little is known about the packing of the prolamins and 2S-proteins in the protein bodies.
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