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• W2055083344 abstract "A putative DNA glycosylase encoded by the Rv3297 gene (MtuNei2) has been identified in Mycobacterium tuberculosis. Our efforts to express this gene in Escherichia coli either by supplementing tRNAs for rare codons or optimizing the gene with preferred codons for E. coli resulted in little or no expression. On the other hand, high-level expression was observed using a bicistronic expression vector in which the target gene was translationally coupled to an upstream leader sequence. Further comparison of the predicted mRNA secondary structures supported the hypothesis that mRNA secondary structure(s) surrounding the translation initiation region (TIR), rather than codon usage, played the dominant role in influencing translation efficiency, although manipulation of codon usage or tRNA supplementation did further enhance expression in the bicistronic vector. Addition of a cleavable N-terminal tag also facilitated gene expression in E. coli, possibly through a similar mechanism. However, since cleavage of N-terminal tags is determined by the amino acid at the P1′ position downstream of the protease recognition sequence and results in the addition of an extra amino acid in front of the N-terminus of the protein, this strategy is not particularly amenable to Fpg/Nei family DNA glycosylases which carry the catalytic proline residue at the P1′ position and require a free N-terminus. On the other hand, the bicistronic vector constructed here is potentially valuable particularly when expressing proteins from G/C rich organisms and when the proteins carry proline residues at the N-terminus in their native form. Thus the bicistronic expression system can be used to improve translation efficiency of mRNAs and achieve high-level expression of mycobacterial genes in E. coli." @default.
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• W2055083344 date "2009-06-01" @default.
• W2055083344 modified "2023-09-27" @default.
• W2055083344 title "A novel bicistronic vector for overexpressing Mycobacterium tuberculosis proteins in Escherichia coli" @default.
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• W2055083344 doi "https://doi.org/10.1016/j.pep.2008.12.013" @default.
• W2055083344 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2747733" @default.
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