Genetically engineered bacterium strain for producing D-1,2,4-butantriol by utilizing D-xylose as well as construction method and application of genetically engineered bacterium

The invention discloses a genetically engineered bacterium strain for producing D-1,2,4-butantriol by utilizing D-xylose. The construction method comprises the following steps: constructing two plasmids such as PMB and PGP, introducing the two constructed plasmids into Escherichia coli E.coliBL21(DE3) to construct a recombination strain E.coliBL21-PMB-PGP, and performing whole-cell catalysis to produce the D-1,2,4-butantriol. According to the method disclosed by the invention, the problems that a fermentation method is long in production cycle, the metabolite is complicated, the substrate conversion rate is low, the product is difficult to separate and extract and the energy consumption is high are solved; the defect that the catalytic process is difficult to realize in an enzymatic methodis overcome; and the catalytic efficiency is improved, and the enzyme purification process is saved. 本发明公开了株利用D-木糖生产D-1,2,4-丁三醇的基因工程菌，先构建两种质粒PMB和PGP，再将已构建好的双质粒导入到大肠杆菌E.coliBL21(DE3)中构建好重组菌株E.coliBL21-PMB-PGP，全细胞催化生产D-1,2,4丁三