NDLI: Anaerobic synthesis of succinic acid by recombinant Escherichia coli strains with activated NAD+-reducing pyruvate dehydrogenase complex

Content Provider	Springer Nature Link
Author	Skorokhodova, A. Yu. Gulevich, A. Yu. Morzhakova, A. A. Shakulov, R. S. Debabov, V. G.
Copyright Year	2011
Abstract	Effect of constitutive expression of the aceEF-lpdA operon genes coding for the enzymes of NAD+-reducing pyruvate dehydrogenase complex on the anaerobic production of succinic acid from glucose by recombinant Escherichia coli strains was studied. Basic producer strains were obtained by inactivation of the main pathways for synthesis of acetic and lactic acids through deletion of the genes ackA, pta, poxB, and ldhA (SGM0.1) in E. coli MG1655 strain and by additional introduction of the Bacillus subtilis pyruvate carboxylase (SGM0.1 [pPYC]). A constitutive expression of the genes aceEF-lpdA in derivatives of the basic strains SGM0.1 PL-aceEF-lpdA and SGM0.1 PL-aceEF-lpdA [pPYC] was provided by replacing the native regulatory region of the operon with the lambda phage PL promoter. Molar yields of succinic acid in anaerobic glucose fermentation by strains SGM0.1 PL-aceEF-lpdA and SGM0.1 PL-aceEF-lpdA [pPYC] exceeded the corresponding yields of control strains by 2 and 33% in the absence and by 9 and 26% in the presence in media of HCO 3 − ion. It is concluded that an increase in the succinic acid production by strain SGM0.1 PL-aceEF-lpdA [pPYC] as compared with the strains SGM0.1 and SGM0.1 [pPYC], which synthesize this substance in the reductive branch of the tricarboxylic acid cycle, is caused by activation of the glyoxylate shunt.
Starting Page	373
Ending Page	380
Page Count	8
File Format	PDF
ISSN	00036838
Journal	Applied Biochemistry and Microbiology
Volume Number	47
Issue Number	4
e-ISSN	16083024
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-07-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochemistry Medical Microbiology Microbiology
Content Type	Text
Resource Type	Article
Subject	Biochemistry Applied Microbiology and Biotechnology

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