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. 1978 Jun;61(6):918–923. doi: 10.1104/pp.61.6.918

Protein Synthesis and Accumulation in Bean Cotyledons during Growth 1

Samuel M Sun 1, Martha A Mutschler 1, Fredrick A Bliss 1, Timothy C Hall 1
PMCID: PMC1092012  PMID: 16660426

Abstract

Analysis of total protein, of specific proteins by gel electrophoresis and immunoelectrophoresis, and of protein synthetic activity in vitro confirmed that intense protein synthesis and accumulation occurred as the French bean (Phaseolus vulgaris L). seed grew from 12 to 20 millimeters. These techniques showed that there was no globulin-1 (G1) fraction (requiring high salt for solubility) present in 6-millimeter seeds, and only very small amounts were synthesized in seeds less than 9 millimeters long. The 7- to 9-millimeter stages represent a 2-day transition period over which genetic information for the G1 protein becomes actively expressed, accounting for at least 50% of all protein synthesized in this tissue during the following 14 days. At maturity, the electrophoretic analysis confirmed that G1 globulin was the major storage protein, representing some 50% of the dry seed protein. Cell-free protein synthesis assays, including immunoprecipitation of the in vitro products, clearly showed G1 polypeptides to be among the polysome-directed products.

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Selected References

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