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Synthesis of pyrroloquinoline quinone by recombinant Gluconobacter oxydans / 生物工程学报
Chinese Journal of Biotechnology ; (12): 1138-1149, 2020.
Artículo en Chino | WPRIM | ID: wpr-826864
ABSTRACT
Pyrroloquinoline quinone (PQQ), an important redox enzyme cofactor, has many physiological and biochemical functions, and is widely used in food, medicine, health and agriculture industry. In this study, PQQ production by recombinant Gluconobacter oxydans was investigated. First, to reduce the by-product of acetic acid, the recombinant strain G. oxydans T1 was constructed, in which the pyruvate decarboxylase (GOX1081) was knocked out. Then the pqqABCDE gene cluster and tldD gene were fused under the control of endogenous constitutive promoter P0169, to generate the recombinant strain G. oxydans T2. Finally, the medium composition and fermentation conditions were optimized. The biomass of G. oxydans T1 and G. oxydans T2 were increased by 43.02% and 38.76% respectively, and the PQQ production was 4.82 and 20.5 times higher than that of the wild strain, respectively. Furthermore, the carbon sources and culture conditions of G. oxydans T2 were optimized, resulting in a final PQQ yield of (51.32±0.899 7 mg/L), 345.6 times higher than that of the wild strain. In all, the biomass of G. oxydans and the yield of PQQ can be effectively increased by genetic engineering.
Asunto(s)

Texto completo: Disponible Índice: WPRIM (Pacífico Occidental) Asunto principal: Microbiología Industrial / Familia de Multigenes / Regiones Promotoras Genéticas / Organismos Modificados Genéticamente / Gluconobacter oxydans / Cofactor PQQ / Técnicas de Inactivación de Genes / Fermentación / Genética / Metabolismo Idioma: Chino Revista: Chinese Journal of Biotechnology Año: 2020 Tipo del documento: Artículo

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Texto completo: Disponible Índice: WPRIM (Pacífico Occidental) Asunto principal: Microbiología Industrial / Familia de Multigenes / Regiones Promotoras Genéticas / Organismos Modificados Genéticamente / Gluconobacter oxydans / Cofactor PQQ / Técnicas de Inactivación de Genes / Fermentación / Genética / Metabolismo Idioma: Chino Revista: Chinese Journal of Biotechnology Año: 2020 Tipo del documento: Artículo