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. 1988 Jul;8(7):2737–2744. doi: 10.1128/mcb.8.7.2737

Leader length and secondary structure modulate mRNA function under conditions of stress.

M Kozak 1
PMCID: PMC363489  PMID: 3405216

Abstract

Simian virus 40-based plasmids that direct the synthesis of preproinsulin in cultured monkey cells were used to study the effects of mRNA structure on translational efficiency. Lengthening the leader sequence enhanced translation in this system. The enhancement was most obvious when an unstructured sequence (two, four, or eight copies of the oligonucleotide AGCTAAGTAAGTAAGTA) was inserted upstream from a region of deliberate secondary structure; the degree of enhancement was proportional to the number of copies of the inserted oligonucleotide. Lengthening the leader sequence on the 3' side of a stem-and-loop structure, in contrast, did not offset the potentially inhibitory effect of the hairpin structure. Both the facilitating effect of length and the inhibitory effect of secondary structure were demonstrated most easily under conditions of mRNA competition, which was brought about by an abrupt shift in the tonicity of the culture medium. These experiments suggest a simple structural basis for the long-recognized differential response of viral and cellular mRNAs to hypertonic stress. The fact that the translatability of structure-prone mRNAs varies with changes in the environment may also have general implications for gene expression in eucaryotic cells.

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