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A combinatorial model predicts leaderless mRNA start codon selection in C. crescentus

View ORCID ProfileMohammed-Husain M. Bharmal, View ORCID ProfileJared M. Schrader
doi: https://doi.org/10.1101/2020.05.06.081141
Mohammed-Husain M. Bharmal
Department of Biological Sciences, Wayne State University, Detroit, MI, 48202, USA
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Jared M. Schrader
Department of Biological Sciences, Wayne State University, Detroit, MI, 48202, USA
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  • For correspondence: Schrader@wayne.edu
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Abstract

Bacterial translation is thought to initiate by base-pairing of the 16S rRNA and the Shine-Dalgarno sequence in the mRNA’s 5’ UTR. However, transcriptomics has revealed that leaderless mRNAs, which completely lack any 5’ UTR, are broadly distributed across bacteria and can initiate translation in the absence of the Shine-Dalgarno sequence. To investigate the mechanism of leaderless mRNA translation initiation, synthetic in vivo translation reporters were designed that systematically tested the effects of start codon accessibility, leader length, and start codon identity on leaderless mRNA translation initiation. Using this data, a simple computational model was built based on the combinatorial relationship of these mRNA features which can accurately classify leaderless mRNAs and predict the translation initiation efficiency of leaderless mRNAs. Thus, start codon accessibility, leader length, and start codon identity combine to define leaderless mRNA translation initiation in bacteria.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted May 08, 2020.
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A combinatorial model predicts leaderless mRNA start codon selection in C. crescentus
Mohammed-Husain M. Bharmal, Jared M. Schrader
bioRxiv 2020.05.06.081141; doi: https://doi.org/10.1101/2020.05.06.081141
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A combinatorial model predicts leaderless mRNA start codon selection in C. crescentus
Mohammed-Husain M. Bharmal, Jared M. Schrader
bioRxiv 2020.05.06.081141; doi: https://doi.org/10.1101/2020.05.06.081141

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