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• W2019926191 endingPage "61" @default.
• W2019926191 startingPage "49" @default.
• W2019926191 abstract "In this study we investigate the effect of thioredoxin (Trx1) protein fusions in the production, oxidation, and folding of single chain Fv (scFv) antibodies in the cytoplasm of Escherichia coli. We analyze the expression levels, solubility, disulfide-bond formation, and antigen-binding properties of Trx1–scFv fusions in E. coli wild-type cells and isogenic strains carrying mutations in the glutathione oxidoreductase (gor) and/or thioredoxin reductase (trxB) genes. We compare the Trx1–scFv fusions with other reported systems for production of scFv in the cytoplasm of E. coli, including protein fusions to the maltose-binding protein. In addition, we analyze the effect of co-expressing a signal-sequence-less derivative of the periplasmic chaperone and disulfide-bond isomerase DsbC (ΔssDsbC), which has been shown to act as a chaperone for scFvs in the cytoplasm. The results reported here demonstrate that Trx1 fusions produce the highest expression level and induce the correct folding of scFvs even in the absence of ΔssDsbC in the cytoplasm of E. coli trxB gor cells. The disulfide bridges of Trx1–scFv fusions were formed correctly in E. coli trxB gor cells, but not in trxB single mutants. Antigen-binding assays showed that Trx1 has only a minor influence in the affinity of the scFv, indicating that Trx1–scFv fusions can be used without removal of the Trx1 moiety. In addition, we proved that a Trx1“AGPA” variant, having its catalytic cysteine residues mutated to alanine, was fully capable of assisting the folding of the fused scFvs. Taken together, our data indicate that the Trx1 moiety acts largely as an intramolecular protein chaperone, not as a disulfide bond catalyst, inducing the correct folding of scFvs in the cytoplasm of E. coli trxB gor cells." @default.
• W2019926191 created "2016-06-24" @default.
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• W2019926191 date "2006-03-01" @default.
• W2019926191 modified "2023-10-18" @default.
• W2019926191 title "Thioredoxin Fusions Increase Folding of Single Chain Fv Antibodies in the Cytoplasm of Escherichia coli: Evidence that Chaperone Activity is the Prime Effect of Thioredoxin" @default.
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• W2019926191 doi "https://doi.org/10.1016/j.jmb.2005.12.058" @default.
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