Ester production and metabolic flux redistribution in Escherichia coli under aerobic conditions

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dc.contributor.advisorSan, Ka-Yiuen_US
dc.creatorSingh, Randeepen_US
dc.date.accessioned2009-06-04T08:22:04Zen_US
dc.date.available2009-06-04T08:22:04Zen_US
dc.date.issued2005en_US
dc.description.abstractTwo alcohol acetyltransferases from Saccharomyces cerevisiae (ATF1 and ATF2) can catalyze the esterification of isoamyl alcohol and acetyl coenzyme A (acetyl-CoA). The respective genes were cloned from and expressed in an appropriate ack-pta strain of Escherichia coli. The new genetically engineered strains of E. coli produce isoamyl acetate, an ester, when isoamyl alcohol is added externally to the cell culture medium. Since acetyl-CoA is a substrate for this esterification reaction, the competing ackA-pta pathway at the acetyl-CoA node was inactivated to increase the intracellular acetyl-CoA pool and divert more carbon flux to the ester synthesis pathway. Experiments were carried out in aerobic shake flasks to investigate isoamyl acetate production over long periods of growth at various temperatures and starting optical densities. The ackA-pta mutant strain containing the pBAD-ATF1 plasmid exhibited the highest molar ester yield from glucose (1.13) after 48 hours of aerobic growth at 25°C.en_US
dc.format.extent81 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS BIOENG. 2006 SINGHen_US
dc.identifier.citationSingh, Randeep. "Ester production and metabolic flux redistribution in Escherichia coli under aerobic conditions." (2005) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/17918">https://hdl.handle.net/1911/17918</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/17918en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectMicrobiologyen_US
dc.subjectBiochemistryen_US
dc.subjectChemical engineeringen_US
dc.titleEster production and metabolic flux redistribution in Escherichia coli under aerobic conditionsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentBioengineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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