PMID: 7083049Mar 1, 1982Paper

Synthesis and turnover of proteins and mRNA in germinating wheat embryos

Canadian Journal of Biochemistry
Z F GrzelczakB G Lane


The most prominent methionine-labeled protein made when cell-free systems are programmed with bulk mRNA from dry wheat embryos has been identified with what may be the most abundant protein in dry wheat embryos. The protein has been brought to purity and has a distinctive amino acid composition, Gly and Glx accounting for almost 40% of the total amino acids. Designated E because of its conspicuous association with early inhibition of dry wheat embryos, the protein and its mRNA are abundant during the "early" phase (0--1 h) of postimbibition development, and easily detected during "lag" phase (1--5 h), but they are almost totally degraded soon after entry into the "growth" phase of development, by about 10 h postimbibition. The most prominent methionine-labeled protein peculiar to the cell-free translational capacity of bulk mRNA from "growth" phase embryos is not detected as a product of in vivo synthesis. Its electrophoretic properties and its time course of emergence, after 5 h postimbibition development, suggest that this major product of cell-free synthesis may be an in vitro counterpart to a prominent methionine-labeled protein made only in vivo, by "growth" phase embryos. Designated G because of its conspicuous associatio...Continue Reading


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