Ribosome binding site analysis of ovalbumin messenger ribonucleic acid - PubMed (original) (raw)
Ribosome binding site analysis of ovalbumin messenger ribonucleic acid
H W Schroeder Jr et al. Biochemistry. 1979.
Abstract
The region of the ovalbumin messenger ribonucleic acid (mRNAov) molecule bound to the 40S ribosomal subunit and its associated initiation factors in the wheat germ cell-free translation system were isolated and characterized. Two mRNAov fragments, 87 and 92 nucleotides in length, were protected from T1 ribonuclease digestion by binding of guanosine 5',beta,gamma-methylenetriphosphate and were shown by hybridization and fingerprint mapping to be derived from the 5' end of mRNAov. Both these mRNAov fragments were of sufficient length to contain both the cap structure and the AUG initiation codon. Four T1-resistant oligonucleotides, prepared by direct digestion of mRNAov with T1 ribonuclease were also found to bind to the wheat germ 40S ribosomal subunit. Nucleotide sequence analysis of these oligonucleotides revealed (1) that they were not a subset of the ribosome binding fragments described above, (2) that they were derived from within the mRNAov molecule (one from within the coding region and three from the noncoding region at the 3' end of the mRNAov molecule), and (3) that three of the four mRNAov nucleotides contained 3'-terminal AUG trinucleotides. These data suggested that features of the mRNAov molecule in addition to the nucleotide sequence might be important in specifying the correct ribosome binding site for the initiation of protein synthesis. The amount of mRNAov bound to the wheat germ 40S ribosomal subunit in a preinitiation complex was found to vary inversely with the potassium ion concentration. Lowering the potassium concentration to levels suboptimal for translation also resulted in the protection of larger fragments of the mRNAov molecule derived from the same 5'-end region as the ribosome binding fragments described above. The ability of the cap analogue 7-methylguanosine 5'-phosphate (m7G5'p) to reduce the amount of mRNAov bound to the wheat germ 40S ribosomal subunit was found to depend directly on thepotassium concentration. Interestingly, the effects of potassium on the amount of mRNAov bound in a preinitiation complex and the inhibition of this binding by m7G5'p could be observed by changing the potassium concentration after binding had occurred. These data suggested that the interaction between the wheat germ 40S ribosomal subunit and mRNAov was very sensitive to the ionic environment.
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