Dec 7, 2019

Induced heterologous expression of the arginine deiminase pathway promotes growth advantages in the strict anaerobe Acetobacterium woodii

Applied Microbiology and Biotechnology
Matthias H BeckPeter Dürre

Abstract

The advantage of using acetogens such as Acetobacterium woodii as biocatalysts converting the cheap substrate and greenhouse gas carbon dioxide (CO2) into value-added chemicals comes together with the disadvantage of a low overall ATP gain due to the bioenergetics associated with the Wood-Ljungdahl pathway. Expanding the product spectrum of recombinant A. woodii strains to compounds with high ATP-demanding biosynthesis is therefore challenging. As a least invasive strategy for improved ATP generation, the exploitation of the arginine deiminase pathway (ADI) was examined under native conditions and via using heterologously expressed genes in A. woodii. Several promoters were analyzed for application of different gene expression levels in A. woodii using β-glucuronidase assays. Heterologous expression of the ADI pathway genes from Clostridium autoethanogenum was controlled using either the constitutive pta-ack promoter from Clostridium ljungdahlii or a tightly regulated tetracycline-inducible promoter Ptet. Unlike constitutive expression, only induced expression of the ADI pathway genes led to a 36% higher maximal OD600 when using arginine (OD600 3.4) as nitrogen source and a 52% lower acetate yield per biomass compared to cells ...Continue Reading

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Mentioned in this Paper

Biochemical Pathway
Genes
TNK2
Yeasts
Beta-glucuronidase
Promoter
Gene Expression
Carbon Fixation by acetyl-CoA Pathway
Clostridium ljungdahlii
Nitrogen

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