Glutathione production by efficient ATP-regenerating Escherichia coli mutants.

There is an ongoing demand to improve the ATP-regenerating system for industrial ATP-driven bioprocesses because of the low efficiency of ATP regeneration. To address this issue, we investigated the efficiency of ATP regeneration in Escherichia coli using the Permeable Cell Assay. This assay identified 40 single-gene deletion strains that had over 150% higher total cellular ATP synthetic activity relative to the parental strain. Most of them also showed higher ATP-driven glutathione synthesis. The deleted genes of the identified strains that showed increased efficiency of ATP regeneration for glutathione production could be divided into the following four groups: (1) glycolytic pathway-related genes, (2) genes related to degradation of ATP or adenosine, (3) global regulatory genes, and (4) genes whose contribution to the ATP regeneration is unknown. Furthermore, the high glutathione productivity of DeltanlpD, the highest glutathione-producing mutant strain, was due to its reduced sensitivity to the externally added ATP for ATP regeneration. This study showed that the Permeable Cell Assay was useful for improving the ATP-regenerating activity of E. coli for practical applications in various ATP-driven bioprocesses, much as that of glutathione production.

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