Abstract
The storage proteins of rice seed differ from those of most cereals, other than oats, in that globulin rather than prolamin is the most abundant storage protein (Muench and Okita, 1997a). Although the prolamins are a smaller component of the storage proteins in rice, they are present in large enough quantities that they represent a significant source of protein in the diet of humans as a result of the high consumption of rice throughout the world. However, a considerable percentage of the rice prolamins is not easily digestable by monogastric animals, thereby reducing the nutritional quality of the rice seed. Prolamin and glutelin (a globulin-like protein) are deposited into separate protein bodies in rice seed and these protein bodies originate through different pathways of deposition. Our current knowledge of the rice prolamins demonstrates that this group of proteins has a number of characteristics that are different from the prolamins of most other cereals. This chapter presents a summary of what is known about the rice prolamins, emphasizing their unique characteristics in primary structure, synthesis and deposition.
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