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dc.contributor.authorTomar, Atin
dc.date.accessioned2014-03-05T16:03:03Z
dc.date.available2014-03-05T16:03:03Z
dc.date.issued2002-05
dc.identifier.othertomar_atin_200205_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/tomar_atin_200205_ms
dc.identifier.urihttp://hdl.handle.net/10724/29445
dc.description.abstractPyruvate is a three-carbon (triose) ketoacid central to metabolism that could potentially be produced by fermentation. Previous studies observed pyruvate accumulation in strains having mutations in the acetate pathway. The present study applies metabolic engineering strategies to E. coli strains that generate limited acetate under normal growth conditions. Of the various acetate synthesis mutants, strains with a mutation in pyruvate dehydrogenase (PDH) complex (aceE, aceF, lpd) produced more pyruvate than pta, ack or rpoS mutants. Higher growth and pyruvate production rates were observed in complex media compared to minimal media. pH and temperature also affected pyruvate generation, with a pH of 7.0 and a temperature of 32 °C optimum for pyruvate generation in strains with a PDH complex mutation. The highest rate of pyruvate generation occurred during the growth phase. A deletion in the ppc gene encoding for phosphoenolpyruvate carboxylase was observed to direct more carbon flux to pyruvate. Acetate generation by PDH mutant strains was attributed to pyruvate oxidase activity. A final concentration of 38 g/L was achieved using a fed-batch strategy.
dc.languageProduction of pyruvate by Escherichia coli using metabolic engineering
dc.publisheruga
dc.rightspublic
dc.subjectPyruvate
dc.subjectEscherichia coli
dc.subjectAcetate mutants
dc.subjectPyruvate Dehydrogenase complex
dc.subjectPhosphoenolpyruvate carboxylase
dc.subjectPyruvate oxidase
dc.subjectNADH oxidase
dc.titleProduction of pyruvate by Escherichia coli using metabolic engineering
dc.typeThesis
dc.description.degreeMS
dc.description.departmentBiological and Agricultural Engineering
dc.description.majorBiological Engineering
dc.description.advisorMark A. Eiteman
dc.description.committeeMark A. Eiteman
dc.description.committeeW. Barny Whitman
dc.description.committeeJames R. Kastner


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