PMID: 6111454Feb 1, 1981Paper

Segregation of specific classes of messenger RNA into free and membrane-bound polysomes

European Journal of Biochemistry
M Adesnik, F Maschio

Abstract

Analysis of mRNA populations from rat liver rough microsomes and free polysomes by homologous and heterologous cDNA . mRNA hybridization shows that the two mRNA populations are distinct, demonstrating that specific mRNA classes are efficiently segregated for translation in association with endoplasmic reticulum membranes. We estimate that approximately 90% of the mRNA in membrane-bound polysomes contains a diverse set of messengers with a minimum of 500--2000 different species although approximately 5--8 messengers may constitute 25--30% of the mRNA mass. The complexity of the mRNA population of free polysomes appears to be comparable to that estimated for total liver poly(A) + mRNA by other investigators, and is likely to be substantially greater than that of the bulk of bound mRNA. In addition, mRNA in free polysomes lacks the high abundance class characteristic of mRNA-bound polysomes. The substantial complexity of the bound mRNA population suggests that the segregation of polysomes in rough microsomes is not limited to a small class specialized in manufacturing secretory proteins, but extends to polysomes engaged in the synthesis of proteins for intracellular distribution. The segregation of specific messengers into the fre...Continue Reading

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Jan 1, 1982·Archives of Virology· Melnikov SYaY Z Ghendon
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