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- W1489232234 abstract "The polyadenylic acid-containing messenger ribonucleic acid from rabbit reticulocyte polyribosomes, isolated by a rapid and very gentle procedure (Krystosek, A., Cawthon, M. L., and Kabat, D. (1975) J. Biol. Chem. 250, 6077-6084), sediments in a sucrose gradient in three sharp peaks, at 9 S, 17 to 18 S, and 28 S. The alpha and beta globin messenger activity follows the absorbance profile in the sucrose gradients and has its major peak at 17 to 18 S. The larger messengers are more active than 9 S messenger by approximately 2-fold per mass unit of ribonucleic acid or by at least 8-fold per molecule. The major 17 to 18 S form of globin messenger was examined further and was shown to be a 1:1 complex of 9 S messenger and 18 S ribosomal ribonucleic acid. The effect of 18 S ribosomal ribonucleic acid on translation of purified 9 S globin messenger was analyzed in a messenger-dependent protein-synthesizing system (Krystosek, A., Cawthon, M. L., and Kabat, D. (1975) J. Biol. Chem. 250, 6077-6084). In the absence of exogenous ribosomal ribonucleic acid, 9 S messenger is inefficiently translated; a large excess of messenger is required to saturate the system; and globin is synthesized mainly on di- and monoribosomes. Exogenous liver or reticulocyte 18 S ribosomal ribonucleic acid potentiates 9 S messenger translation and renders it at least 10 times more efficient. The potentiation reaction can also be accomplished by increasing the concentration of ribosomes in the assay system. However, transfer or messenger ribonucleic acids cannot carry out this reaction. It is proposed that 9 S globin messenger ribonucleic acid is an inactive molecule which is normally potentiated by specific reversible base pairing with an accessible region of ribosomal ribonucleic acid contained in a 40 S ribosomal subunit. The potentiated messenger interacts with initiation factors and with other ribosomal subunits to synthesize protein. Potentiation is the first specific function in protein synthesis demonstrated for the ribosomal ribonucleic acid portion of ribosomes." @default.
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- W1489232234 date "1975-08-01" @default.
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- W1489232234 title "Potentiation of hemoglobin messenger ribonucleic acid. A step in protein synthesis initiation involving interaction of messenger with 18 S ribosomal ribonucleic acid." @default.
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- W1489232234 doi "https://doi.org/10.1016/s0021-9258(19)41162-9" @default.
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