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Engineering the pathway for succinate production

Inactive Publication Date: 2012-03-08
UNIV OF FLORIDA RES FOUNDATION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]In certain preferred embodiments of the invention, the expression of certain endogenous genes is significantly increased. In one aspect of the present invention, the transcription of the endogenous gene is increased by means of introducing certain mutations in the promoter region of the endogenous genes. In other aspect of the invention, the transcription of the endogenous gene is enhanced by means of reliving the repressive control of the target gene.
[0023]In one embodiment of the present invention the genes functioning within the TCA cycle are genetically manipulated so that there is an increased flow of carbon towards succinic acid production. In one aspect of the present invention, the carbon flow through reductive arm of the TCA cycle is enhanced. In another aspect of the present invention, the carbon flow through oxidative arm of the TCA cycle is genetically manipulated. In another aspect of the present invention, the carbon flow to succinic acid is improved through genetic manipulation of glyoxalate bypass pathway closely associated with TCA cycle.
[0025]In another embodiment of the present invention, the carbon flow into the TCA cycle is enhanced through genetic manipulation leading to one of more carboxylating enzymes within the cell. In one aspect of the present invention, the expression of one or more carboxylating enzyme is achieved through the genetic manipulation of the promoter region or by relieving the repression of the gene expression.

Problems solved by technology

However, complex processes, expensive growth media and long incubation times are often required to produce succinic acid from these naturally occurring succinic acid producing microorganisms.
However, the use of complex nutrients for production of bacterial fermentation products increases the cost of materials, the cost of purification, and the cost associated with waste disposal.

Method used

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  • Engineering the pathway for succinate production
  • Engineering the pathway for succinate production
  • Engineering the pathway for succinate production

Examples

Experimental program
Comparison scheme
Effect test

example 1

Construction of KJ073 Strain for Succinate Production

[0146]In the construction of a strain suitable for succinic acid production in minimal medium containing 5% glucose, both a rational design approach and metabolic evolution were followed. By inspection of FIG. 1 illustrating the generally accepted standard fermentation pathways for E. coli, a rational design for the metabolic engineering of strains producing succinate was devised in which insertional inactivations were made in genes encoding the terminal steps for all alternative products: lactate (ldhA), ethanol (adhE) and acetate (ackA). Results from this metabolic engineering by rational design were completely unexpected. The KJ012 (ΔldhA::FRT ΔadhE::FRT ΔackA::FRT) strain resulting from the insertional inactivation of ldhA, adhE and ack genes grew very poorly under anaerobic conditions in mineral salts medium containing 5% glucose (278 mM) and produced acetate instead of succinate as the primary fermentation product. Counter t...

example 2

Construction of KJ134 Strain for Succinate Production

[0173]As described in the Example 1 above, the central anaerobic fermentation genes in E. coli C wild type were sequentially deleted by the strategy of Datsenko & Wanner (2000) with PCR products and removable antibiotic markers (by using FRT recognition sites and FLP recombinase). These constructions in combination with metabolic evolution (growth-based selection for increased efficiency of ATP production) were used to select for a mutant strain that recruited the energy-conserving, phosphoenolpyruvate carboxykinase (pck) to increase growth and succinate production (FIG. 9). The resulting strain, KJ073, produced 1.2 moles of succinate per mole of metabolized glucose (Jantama et al., 2008a) and uses a succinate pathway quite analogous to the rumen bacteria, Actinobacillus succinogenes (van der Werf et al., 1997) and Mannheimia succiniciproducens (Song et al., 2007). However, methods used to construct these gene deletions left a sin...

example 3

Recruitment of Gluconeogenic PEP Carboxykinase (pck) for Succinate Production

[0184]E. coli has the metabolic potential for four native carboxylation pathways that could be used to produce succinate (FIGS. 2A-2D). The carboxylation of phosphoenolpyruvate (PEP) to oxaloacetate (OAA) by phosphoenolpyruvate carboxylase (ppc) is recognized as the primary pathway for the fermentative production of succinate in E. coli (FIG. 2A). (Fraenkel DG, 1996; Unden & Kleefeld, 2004; Karp et al., 2007). This reaction is essentially irreversible due to the energy loss associated with the release of inorganic phosphate. The three other carboxylation reactions are normally repressed by high concentration of glucose in the medium and also reported to function in the reverse direction for gluconeogenesis. (Samuelov et al., 1991; Oh et al., 2002; Stols & Donnelly, 1997). The second and third carboxylation pathways (FIGS. 2B and 2C) use NADH-linked and NAPDH-linked malic enzymes (sfcA and maeB), respectivel...

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Abstract

This invention relates to the biocatalysts for the efficient production of succinic acid and / or other products from renewable biological feedstocks. The biocatalysts have a very high efficiency for the growth-coupled production of succinic acid and / or other products from carbohydrate feed stocks as a result of both genetic manipulations and metabolic evolution. More specifically, certain biocatalysts of the present invention produce succinic acid at high titers and yield in mineral salts media during simple pH-controlled, batch fermentation without the addition of any exogenous genetic material. The genetic manipulations of the present invention are concerned with the energy-conserving strategies coupled with the elimination of alternative routes for NADH oxidation other than the routes for succinic acid production. The biocatalysts contain glucose-repressed gluconeogenic phosphoenol pyruvate carboxykinase (pck) depressed by genetic modifications and a genetically-inactivated phosphotransferase system. In terms of succinic acid production efficiency, the biocatalysts of the present invention are functionally equivalent to succinate producing rumen bacteria such as Actinobacillus succinogens and Mannheimia succiniproducens with one difference that the biocatalysts are able to achieve this high level of succinic acid production in a minimal salt medium with carbohydrate source as opposed to the requirement for a rich media for succinic acid production by rumen bacteria.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of the U.S. Provisional Application Ser. No. 61 / 166,093, filed on Apr. 2, 2009. This application is also a continuation-in-part of U.S. application Ser. No. 12 / 529,826, filed Sep. 3, 2009, which is the U.S. national stage application of PCT / US2008 / 057439, filed Mar. 19, 2009, which claims the benefit of U.S. Provisional Application Ser. No. 60 / 895,806, filed Mar. 20, 2007, the disclosure of each of which is hereby incorporated by reference in its entirety, including all figures, tables and amino acid or nucleic acid sequences.GOVERNMENT SUPPORT[0002]This invention was made with government support under a grant awarded from the Department of Energy under grant number USDOE-DE FG02-96ER20222 and Department of Energy in conjunction with the United States Department of Agriculture under grant number USDA & DOE Biomass RDI DE FG36-04GO14019. The government has certain rights in the invention.BACKGROUND OF T...

Claims

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Application Information

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IPC IPC(8): C12P7/46C12N1/21
CPCC12P7/46C12N9/88C12N9/93C12Y401/01C12Y604/01001C12N9/1211C12N15/70C12N15/74C12N2830/002C12P7/40
Inventor ZHANG, XUELIJANTAMA, KAEMWICHMOORE, JONATHAN C.JARBOE, LAURA R.SHANMUGAM, KEELNATHAM T.INGRAM, LONNIE O'NEAL
Owner UNIV OF FLORIDA RES FOUNDATION INC
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