Quantitative Correlation between mRNA Secondary Structure around the Region Downstream of the Initiation Codon and Translational Efficiency in Escherichia coli
Translational efficiency in Escherichia coli is known to be strongly influenced by the secondary structure around the ribosome-binding site and the initiation codon in the translational-initiation region of the mRNA. Several quantitative studies have reported that translational efficiency is attributable to effects on ribosome accessibility predominantly caused by the secondary structure surrounding the ribosome-binding site. However, the influence of mRNA secondary structure around regions downstream of the initiation codon on translational efficiency after ribosome-binding step has not been quantitatively studied. Here, we quantitatively analyzed the relationship between secondary structure of mRNA surrounding the region downstream of the initiation codon, referred to as the downstream region (DR), and protein expression levels. Modified hairpin structures containing the initiation codon were constructed by site-directed mutagenesis, and their effects on expression were analyzed in vivo. The minimal folding free energy (dG) of a local hairpin structure was found to be linearly correlated with the relative expression level over a range of 0.3- to 1.2-fold that of the wild-type structure. These results demonstrate that expression can be quantitatively controlled by changing the stability of the secondary structure surrounding the DR.
키워드
secondary structuretranslation efficiencydownstream region
저자
Sang Woo SEO [ Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Gyeongbuk, Korea, 790-784. ]
Jina YANG [ Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Gyeongbuk, Korea, 790-784 ]
Gyoo Yeol JUNG [ 1Department of Chemical Engineering and School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Gyeongbuk, Korea, 790-784. ]
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
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