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US 2026/0078337 A1Published application
E. coli strains having an oxidative cytoplasm
AssigneeSutro Biopharma, Inc.
InventorDaniel Groff
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Abstract
This disclosure provides an E. coli strain, which lacks thioredoxin reductase activity encoded by trxB and thioredoxin 1 activity encoded by trxA, and glutathione reductase activity encoded by gor. Said E. coli strain expresses a mutated AhpC protein having glutathione reductase activity and a cytosolic prokaryotic disulfide isomerase. The E. coli strain has an oxidative cytosol and can be used to efficiently produce proteins having disulfide bonds.
Claims21
An E. coli strain, wherein:
- i) the strain lacks the activity of a thioredoxin reductase encoded by trxB due to genetic mutation of trxB;
- ii) the strain lacks the activity of a thioredoxin 1 encoded by trxA due to genetic mutation of trxA;
- iii) the strain lacks the activity of a glutathione reductase encoded by gor due to genetic mutation of gor;
- iv) the strain expresses a mutated AhpC protein, wherein the mutated AhpC protein has glutathione reductase activity;
- and
- v) the strain expresses a cytosolic disulfide isomerase.
3 more elements
A method for expressing soluble, recombinant proteins of interest in E. coli bacterial strains comprising the steps of:
- culturing an E. coli bacterial strain comprising an oxidizing cytosol and an expression cassette for expressing a protein of interest under conditions that permit expression of the protein of interest as a soluble protein, wherein the expression cassette is configured such that the protein of interest is not exported outside of the cytoplasm of the cell, wherein the strain:
- i) lacks thioredoxin reductase activity due to genetic mutation of trxB;
- ii) lacks thioredoxin 1 activity due to genetic mutation of trxA;
- iii) lacks the activity of a glutathione reductase encoded by gor due to genetic mutation of gor;
- and
- iv) expresses a mutated AhpC protein, wherein the mutated AhpC protein has glutathione reductase activity;
- and
- v) expresses a cytosolic disulfide isomerase.
5 more elements
Dependencies are inferred from the claim text.