PMID:10893421

Citation	Davis, MS , Solbiati, J and Cronan, JE Jr (2000) Overproduction of acetyl-CoA carboxylase activity increases the rate of fatty acid biosynthesis in Escherichia coli. J. Biol. Chem. 275:28593-8
Abstract	Acetyl-CoA carboxylase (ACC) catalyzes the first committed step of the fatty acid synthetic pathway. Although ACC has often been proposed to be a major rate-controlling enzyme of this pathway, no direct tests of this proposal in vivo have been reported. We have tested this proposal in Escherichia coli. The genes encoding the four subunits of E. coli ACC were cloned in a single plasmid under the control of a bacteriophage T7 promoter. Upon induction of gene expression, the four ACC subunits were overproduced in equimolar amounts. Overproduction of the proteins resulted in greatly increased ACC activity with a concomitant increase in the intracellular level of malonyl-CoA. The effects of ACC overexpression on the rate of fatty acid synthesis were examined in the presence of a thioesterase, which provided a metabolic sink for fatty acid overproduction. Under these conditions ACC overproduction resulted in a 6-fold increase in the rate of fatty acid synthesis.
Links	PubMed Online version:10.1074/jbc.M004756200
Keywords	Acetyl-CoA Carboxylase/physiology; Escherichia coli/metabolism; Fatty Acids/biosynthesis
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Phenotype of	Taxon Information	Genotype Information (if known)	Condition Information	OMP ID	OMP Term Name	ECO ID	ECO Term Name	Notes
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12	Genotype of Reference Strain: accA Genotype of Experimental Strain : accA⁺⁺	Reference Condition:	OMP:0000267	increased gene expression	ECO:0000178	in vivo assay evidence	Increase Acetyle COA Carboxylase activity upon over expression. See table 1.
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12	Genotype of Reference Strain: accB Genotype of Experimental Strain : accB⁺⁺	Reference Condition:	OMP:0000267	increased gene expression	ECO:0000178	in vivo assay evidence	Increase Acetyle COA Carboxylase activity upon over expression. See table 1.
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12	Genotype of Reference Strain: accC Genotype of Experimental Strain : accC⁺⁺	Reference Condition:	OMP:0000267	increased gene expression	ECO:0000178	in vivo assay evidence	Increase Acetyle COA Carboxylase activity upon over expression. See table 1.
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12	Genotype of Reference Strain: accD Genotype of Experimental Strain : accD⁺⁺	Reference Condition:	OMP:0000267	increased gene expression	ECO:0000178	in vivo assay evidence	Increase Acetyle COA Carboxylase activity upon over expression. See table 1.
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