226 results about "Ethanol dehydrogenase" patented technology

The invention discloses an XZ-A26 bacterial strain for producing L-alanine with high yield, which has a preservation number of CGMCC (China General Microbiological Culture Collection Center) No.4036 and has the capacity of generating high-concentration L-alanine through fermentation. The XZ-A26 bacterial strain is constructed by the steps of: integrating an L-alanine dehydrogenase gene on thermophilic fatty bacillus chromosome on lactic dehydrogenase position on an escherichia coli ATCC8739 chromosome, then sequentially knocking out a pyruvate formate lyase gene, an alcohol dehydrogenase gene, an acetokinase gene, a fumaric acid reductase gene and an alanine racemase gene of the escherichia coli chromosome, and then carrying out continuous cell culture in a fermenting tank for obtaining agenetic engineering strain. The invention also relates to a construction method of the XZ-A26 bacterial strain and an application of the XZ-A26 bacterial strain in preparation of the L-alanine. According to the invention, the escherichia coli with the preservation number of CGMCC No.4036 for generating the high-concentration L-alanine through fermentation can be constructed by using a metabolic engineering method, and the yield of the L-alanine generated by using the XZ-A26 bacterial strain reaches up to 115g / L. The XZ-A26 bacterial strain is suitable for industrially producing the L-alanine.

A fusion protein of pyrroloquinoline quinone glucose dehydrogenase (PQQGDH) and a cytochrome is disclosed. PQQGDH is, for example, a water-soluble PQQGDH derived from Acinetobacter calcoaceticus. The cytochrome is, for example, an electron transfer domain of quinohemoprotein ethanol dehydrogenase from Comamonas testosteroni. The fusion protein of the present invention shows intramolecular electron transfer from PQQ, a redox center, to the cytochrome, which allow construction of a direct electron transfer-type glucose sensor which requires no electron mediators.