PMID: 2443708Apr 20, 1987

Translation framing code and frame-monitoring mechanism as suggested by the analysis of mRNA and 16 S rRNA nucleotide sequences

Journal of Molecular Biology
E N Trifonov

Abstract

Protein coding sequences carry an additional message in the form of a universal three-base periodical pattern (G-non-G-N)n, which is expressed as a strong preference for guanines in the first positions of the codons in mRNA and lack of guanines in the second positions. This periodicity appears immediately after the initiation codon and is maintained along the mRNA as far as the termination triplet, where it disappears abruptly. Known cases of ribosome slippage during translation (leaky frameshifts, out-of-frame gene fusion) are analyzed. At the sites of the slippage the G-periodical pattern is found to be interrupted. It reappears downstream from the slippage sites, in a new frame that corresponds to the new translation frame. This suggests that the (G-non-G-N)n pattern in the mRNA may be responsible for monitoring the correct reading frame during translation. Several sites with complementary C-periodical structure are found in the Escherichia coli 16 S rRNA sequence. Only three of them are exposed to various interactions at the surface of the small ribosomal subunit: (517)gcCagCagCegC, (1395)caCacCgcC and (1531)auCacCucC. A model of a frame-monitoring mechanism is suggested based on the weak complementarity of G-periodical mRN...Continue Reading

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Related Concepts

Congenital Structural Myopathy
Alkalescens-Dispar Group
Periodicity
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Protein Biosynthesis
Codon, Initiator
Sense Codon
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Triplet, Centriole
Codon (Nucleotide Sequence)

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