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Codon optimization reveals critical factors for high level expression of two rare codon genes in Escherichia coli: RNA stability and secondary structure but not tRNA abundance
Södertörn University, School of Chemistry, Biology, Geography and Environmental Science. Karolinska Institutet.ORCID iD: 0000-0002-3049-967X
2004 (English)In: Biochemical and Biophysical Research Communications - BBRC, ISSN 0006-291X, E-ISSN 1090-2104, Vol. 313, no 1, 89-96 p.Article in journal (Refereed) Published
Abstract [en]

Expression patterns in Escherichia coli of two small archaeal proteins with a natural content of about 30% rare codons were analyzed. The proteins, a histone-like protein from Sulfolobus shibatae (Ssh10), and a glutaredoxin-like protein from Methanobacterium thermoautotrophicum (mtGrx), were produced with expression plasmids encoding wild-type genes, codon-optimized synthetic, and GST-fusion genes. These constructs were expressed in BL21 (DE3), its LysS derivative, and modified strains carrying copies for rare codon tRNAs or deletions in the RNAseE gene. Both Ssh10 and mtGrx expression levels were constitutively high in BL21(DE3) and its derivatives, with the exception of the LysS phenotype, which prevented high level expression of the Ssh10 wild-type gene. Surprisingly, a codon-optimized mtGrx gene construct displayed undetectable levels of protein production. The translational block observed with the synthetic mtGrx gene could be circumvented by using a synthetic mtGrx-glutathione S-transferase (GST) fusion construct or by in vitro translation. Taken together, the results underscore the importance of mRNA levels and RNA stability, but not necessarily tRNA abundance for efficient heterologous protein production in E. coli.

Place, publisher, year, edition, pages
2004. Vol. 313, no 1, 89-96 p.
Keyword [en]
Archaeal proteins, Fusion protein, Heterologous protein expression, Rare codon gene, RNA stability, Structural genomics, bacterial protein, bacterial RNA, glutaredoxin, glutathione transferase, histone, messenger RNA, ribonuclease, transfer RNA, article, codon, controlled study, Escherichia coli, expression vector, fusion gene, gene construct, gene deletion, gene expression, genetic analysis, Methanobacterium thermoautotrophicum, nonhuman, plasmid, priority journal, protein secondary structure, RNA translation, Sulfolobus, wild type, Artificial Gene Fusion, Circular Dichroism, Gene Expression Regulation, Bacterial, Genes, Archaeal, Methanobacterium, Protein Biosynthesis, Protein Structure, Secondary, Recombinant Fusion Proteins, RNA, Messenger, RNA, Transfer, Spectrometry, Mass, Electrospray Ionization, Archaea, Methanothermobacter thermautotrophicus, Sulfolobus shibatae
National Category
Biochemistry and Molecular Biology
URN: urn:nbn:se:sh:diva-23241DOI: 10.1016/j.bbrc.2003.11.091ISI: 000187745900015PubMedID: 14672702ScopusID: 2-s2.0-0346850783OAI: diva2:715600
Available from: 2014-05-05 Created: 2014-04-16 Last updated: 2016-01-08Bibliographically approved

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Berndt, Kurt D.
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