Biosynthesis of Pea Seed Proteins: Evidence for Precursor Forms from In Vivo and In Vitro Studies
In his review of seed formation, Dure (1975) pointed out that although relatively little is known about seed ontogeny, considerably more is known about the nature of seed storage proteins. This latter topic has frequently been reviewed, particularly for the legumes (Millerd 1975; Derbyshire et al. 1976) and for some of the cereals (Kasarda et al. 1976; Miflin and Shewry 1978). Until recently much less was known about the biosynthesis and deposition of storage proteins than about their size, amino acid composition and genetic variability (for review see Spencer and Higgins 1979; Müntz 1977). This state of affairs has now begun to change and a number of groups have tackled the problem of defining some of the factors regulating storage protein biosynthesis. The general approach so far has been to attempt to determine the role of mRNA level in controlling the rate of reserve protein synthesis. Little attention has been given so far to the role of post-transcriptional control (e.g., mRNA turnover), translational control (e.g., ribosome activity, tRNA levels, soluble enzymes of the translational apparatus) or post-translational controls (e.g., protein turnover, protein processing or protein sequestration).
KeywordsFormaldehyde Maize Urea Electrophoresis Fractionation
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