Jiangnan University

Shandong Runde Biotechnology Co., Ltd

Taixing Dongsheng Bio-Tech Co., Ltd

Wei Lu

Jian Chen

Guocheng Du

Jianghua Li

Long Liu

Jingwen Zhou

Xueqin Lv

Jianxing Lu

Changfeng Liu

Hongzhi Zhang

Bohan Zhang

Fei Yu

Yuan Qian

Xinrui Zhao

Zhu Jiang

The disclosure discloses a genetically engineered strain for producing porcine myoglobin and fermentation and purification thereof, and belongs to the technical field of genetic engineering. The disclosure realizes efficient secretion and expression of porcine myoglobin by integrating the gene of porcine myoglobin in. On this basis, optimization of the medium and culture conditions of recombinantcan significantly increase the titer of porcine myoglobin, so that the titer can reach 285.42 mg/L under fermenter conditions. In addition, by creatively adding different concentrations of ammonium sulfate to fermentation broth step by step, the purity of myoglobin obtained by final concentration is up to 88.0%, and the purification rate is up to 66.1%. The disclosure realizes efficient expression and high purification of porcine myoglobin from various steps such as synthesis, fermentation and purification of porcine myoglobin, and provides broad prospects for industrial production of porcine myoglobin.

Genetically engineered strain for producing porcine myoglobin and food-grade fermentation and purification thereof

The disclosure herein relates to construction and application of engineering bacteria capable of secreting and expressing diacetylchitobiose deacetylase, and belongs to the technical field of fermentation engineering. Firstly, recombinantcapable of heterologously secreting and expressing a diacetylchitobiose deacetylase gene is constructed, and a signal peptide fragment yncM is added into the recombinant vector for the first time. The signal peptide can secrete the target protein diacetylchitobiose deacetylase outside the cells of the recombinant, and a mutant of the 5'-end untranslated region is acquired, thereby significantly increasing the expression level of the target protein, and greatly simplifying the subsequent enzyme separation and purification steps. When the acquired diacetylchitobiose deacetylase is fermented and cultured in a fermentation medium for 50-60 h, the enzyme activity reaches a maximum of 1,548.7 U/mL, and the maximum yield of the diacetylchitobiose deacetylase is about 620 mg/L. Simultaneously, the method has the advantages of low production cost, mild production conditions, simple purification process steps, safe production operation and the like.

Construction and application of engineering bacteria capable of secreting and expressing diacetylchitobiose deacetylase

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Xintai, China

Wei Lu