Fermentation characterization and flux analysis of recombinant strains of Clostridium acetobutylicum with an inactivated solR gene.
The effect of solR inactivation on the metabolism of Clostridium acetobutylicum was examined using fermentation characterization and metabolic flux analysis. The solR-inactivated strain (SolRH) of this study had a higher rate of glucose utilization and produced higher solvent concentrations (by 25%, 14%, and 81%, respectively, for butanol, acetone, and ethanol) compared to the wild type. Strain SolRH(pTAAD), carrying a plasmid-encoded copy of the bifunctional alcohol/aldehyde dehydrogenase gene (aad) used in butanol production, produced even higher concentrations of solvents (by 21%, 45%, and 62%, respectively, for butanol, acetone, and ethanol) than strain SolRH. Clarithromycin used for strain SolRH maintenance during SolRH(pTAAD) fermentations did not alter product formation; however, tetracycline used for pTAAD maintenance resulted in 90% lower solvent production.
Harris
L M
LM
Department of Chemical Engineering, Northwestern University, Evanston, IL 60208, USA.
Blank
L
L
Desai
R P
RP
Welker
N E
NE
Papoutsakis
E T
ET
D000096:Acetone / Q000378:metabolism; D000426:Alcohol Dehydrogenase / Q000235:genetics; D000444:Aldehyde Dehydrogenase / Q000235:genetics; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D000440:Butanols / Q000378:metabolism; D017291:Clarithromycin / Q000494:pharmacology; D003013:Clostridium / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects / Q000235:genetics*; D005798:Genes, Bacterial; D005818:Genetic Engineering; D005947:Glucose / Q000378:metabolism; D007218:Industrial Microbiology / Q000379:methods*; D008954:Models, Biological; D010957:Plasmids / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D012997:Solvents / Q000378:metabolism*; D013752:Tetracycline / Q000494:pharmacology
D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D000440:Butanols; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; D012997:Solvents; D000096:Acetone; D000431:Ethanol; D000426:Alcohol Dehydrogenase; D000444:Aldehyde Dehydrogenase; D013752:Tetracycline; D017291:Clarithromycin; D005947:Glucose