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. 1987 Jan 12;15(1):345–360. doi: 10.1093/nar/15.1.345

Potential secondary structure at translation-initiation sites.

M C Ganoza, E C Kofoid, P Marlière, B G Louis
PMCID: PMC340414  PMID: 3484332

Abstract

Since translational start codons also occur internally, more-complex features within mRNA must determine initiation. We compare the potential secondary structure of 123 prokaryotic mRNA start regions to that of regions coding for internal methionines. The latter display an unexpectedly-uniform, almost-periodic pattern of pairing potential. In contrast, sequences 5' to start codons have little self-pairing, and do not pair extensively with the proximal coding region. Pairing potential surrounding start codons was found to be less than half of that found near internal AUGs. In groups of random sequences where the distribution of nucleotides at each position, or of trinucleotides at each in-frame codon position, matched the observed natural distribution, there was no periodicity in the pairing potential of the internal sequences. Randomized internal sequences had less pairing: the ratio of pairing intensity between internals and starts was reduced from 2.0 to 1.6 by randomization. We propose that the transition from the relatively-unstructured start domains to the highly-structured internal sequences may be an important determinant of translational start-site recognition.

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Selected References

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