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- W1570596073 abstract "The present work deals with the structural-functional organization of regulatory regions of messenger RNAs. Some principles of the action of a translational repressor (coat protein) and the formation of the ribosomal initiation complex at the replicase cistron have been studied with MS2 phage RNA. When the complex of MS2 RNA with the coat protein is treated with T1 ribonuclease, the coat protein selectively protects mainly two fragments (59 and 103 nucleotides in length) from digestion; these fragments contain the intercistronic regulatory region and the beginning of the MS2 replicase cistron. These polynucleotides have been isolated in a pure state and their primary structure has been established. It has been established that both MS2 RNA fragments contain all the necessary information for specific interaction with MS2 coat protein and form a complex with it with an efficiency close to that observed in the case of native MS2 RNA. They also provide the normal polypeptide chain initiation at the replicase cistron. Enzymatic binding of the second aminoacyl-tRNA and electrophoretic analysis of N-terminal dipeptides prove that only the true initiator codon of the replicase cistron is recognized by a ribosome despite the presence of a few additional AUG triplets within the polynucleotides. Under conditions of limited hydrolysis by T1 ribonuclease, the beginning of the replicase cistron has been removed from the shortest polynucleotide leading to a complete loss of its ability to bind both the coat protein and a ribosome. Some principles of the functioning of the regulatory region in MS2 RNA as well as the nature of the initiator signal of protein biosynthesis are discussed." @default.
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- W1570596073 date "1978-02-01" @default.
- W1570596073 modified "2023-09-26" @default.
- W1570596073 title "The regulatory region of MS2 phage RNA replicase cistron" @default.
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- W1570596073 doi "https://doi.org/10.1016/0022-2836(78)90272-3" @default.
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