The present disclosure relates to a method for improving the yield and production intensity of Gluconobacter oxydans (G. oxydans) sorbose, and belongs to the technical field of fermentation engineering. By knocking out genes related to formation of D-sorbitol or L-sorbose metabolic by-products in G. oxydans, the formation of the by-products is reduced, and the efficiency of transforming D-sorbitol into L-sorbose is improved, thereby improving the yield and production intensity of L-sorbose. A recombinant strain G. oxydan-11 constructed by the present disclosure, compared with a control strain, has an L-sorbose transformation rate of 96.12%, which is 4.47% higher than that of a wild strain, has a production intensity of 14 g/L.Math.h, which is 14.7% higher than that of the wild strain, and has a fructose by-product content of only 5.6 g/L, which is 45.6% lower than that of the wild strain.

An engineered bacterial strain expressing dehydrogenases capable of oxidizing D- sorbitol to 2-keto-gulonic acid is provided by the present invention. Methods of using same in a one-pot synthesis of L-ascorbic acid (vitamin C) are also described.

The present disclosure relates to a method for improving the yield and production intensity of Gluconobacter oxydans (G. oxydans) sorbose, and belongs to the technical field of fermentation engineering. By knocking out genes related to formation of D-sorbitol or L-sorbose metabolic by-products in G. oxydans, the formation of the by-products is reduced, and the efficiency of transforming D-sorbitol into L-sorbose is improved, thereby improving the yield and production intensity of L-sorbose. A recombinant strain G. oxydan-11 constructed by the present disclosure, compared with a control strain, has an L-sorbose transformation rate of 96.12%, which is 4.47% higher than that of a wild strain, has a production intensity of 14 g/L.Math.h, which is 14.7% higher than that of the wild strain, and has a fructose by-product content of only 5.6 g/L, which is 45.6% lower than that of the wild strain.