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• W3155016913 abstract "Genes encoding proteins 'toxic' to recombinant host are difficult for cloning/expression and recombinant clones are unstable. Even tightly controlled inducible T7-lac, PBAD, PL, PR promoters are not totally silent in an uninduced state and thus not adequate for highly toxic proteins. An innovative approach to engineering and expression of the gene, encoding bacterial alkaline phosphatase (BAP) is proposed. The native precursor enzyme contains a signal peptide at the N-terminus and is secreted to the Escherichia coli (E. coli) periplasm. The signal peptide is then removed that allows oxidation and formation of active dimers. To decrease toxicity of the bap gene, its secretion leader coding section was replaced with a N-terminal His6-tag. The gene was expressed in E. coli in a PBAD vector, resulting in the accumulation of soluble His6-BAP in the cytoplasm. The His6-BAP was neutral to the cells, as no maturation was possible in the reducing cytoplasm. The purified homogenous protein was further reactivated in a redox buffer containing the protein structure stabilizing cofactors. The His6-BAP exhibited high activity. A dephosphorylation protocol for all types of DNA termini was developed.The method appears well suited for the industrial production of BAP and can be applied to other problematic proteins.• Efficient toxic gene expression • Novel approach to toxic gene cloning, engineering, expression, purification and reactivation of the transiently inactivated enzyme • Scaled-up production of ultrapure BAP • Improved protocol for all types of DNA termini dephosphorylation." @default.
• W3155016913 created "2021-04-26" @default.
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• W3155016913 date "2021-01-01" @default.
• W3155016913 modified "2023-09-29" @default.
• W3155016913 title "A method for the transient inhibition of toxicity of secretory recombinant proteins, exemplified by bacterial alkaline phosphatase. Novel protocol for problematic DNA termini dephosphorylation" @default.
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• W3155016913 doi "https://doi.org/10.1016/j.mex.2021.101340" @default.
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