Gene-recombined peoriae paenibacillus, and construction method and application thereof

The invention discloses a gene-engineered bacterium of gene-recombined peoriae paenibacillus, and a construction method and application of the gene-engineered bacterium. Gene-recombined peoriae paenibacillus BC39 with vitreoscilla hemoglobin regulated and controlled by a P43 strong promoter is constructed by constructing a gene-recombination integrative vector with a peoriae paenibacillus LXH-B-1 strain as host bacteria. The gene-engineered bacterium of the gene-recombined peoriae paenibacillus is capable of intracellularly expressing the vitreoscilla hemoglobin, so that the utilization rate of oxygen by the peoriae paenibacillus, the cell biomass liveweight and the yield of catalysate polypeptide antibiotics can be improved; and the yield of the catalysate polypeptide antibiotics of the engineering strain is increased by 45% compared with that of the original strain; and therefore, an effective way is provided for solving the problem of insufficient oxygen supply in the cell culture and catalysis process of