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Method for the production of glycerol by recombinant organisms

a recombinant organism and glycerol technology, applied in the field of molecular biology and the use of recombinant organisms, can solve the problems of laborious and inefficient processes, limited methods, and often subject to the need to control osmotic stress

Inactive Publication Date: 2006-08-10
NAIR RAMESH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention provides a method for the production of glycerol from a recombinant organism comprising: transforming a suitable host cell with an expression cassette comprising either one or both of (a) a gene encoding a protein having glycerol-3-phosphate dehydrogenase activity and (b) a gene encoding a protein having glycerol-3-phosphate phosphatase activity, where the suitable host cell contains a disruption in either one or both of (a) a gene encoding an endogenous glycerol kinase and (b) a gene encoding an endogenous glycerol dehydrogenase, wherein the disruption prevents the expression of active gene product; culturing the transformed host cell in the presence of at least one carbon source selected from the group consisting of monosaccharides, oligosaccharides, polysaccharides, and single-carbon substrates, whereby glycerol is produced; and recovering the glycerol produced.

Problems solved by technology

Historically, glycerol has been isolated from animal fat and similar sources; however, the process is laborious and inefficient.
This method is limited by the partial inhibition of yeast growth that is due to the sulfites.
Thus, although production of glycerol is possible from naturally occurring organisms, production is often subject to the need to control osmotic stress of the cultures and the production of sulfites.
Although the genes encoding G3PDH and G3P phosphatase have been isolated, there is no teaching in the art that demonstrates glycerol production from recombinant organisms with G3PDH / G3P phosphatase expressed together or separately.
Further, there is no teaching to suggest that efficient glycerol production from any wild-type organism is possible using these two enzyme activities that does not require applying some stress (salt or an osmolyte) to the cell.
The problem to be solved, therefore, is the lack of a process to direct carbon flux towards glycerol production by the addition or enhancement of certain enzyme activities, especially G3PDH and G3P phosphatase which respectively catalyze the conversion of dihydroxyacetone phosphate (DHAP) to glycerol-3-phosphate (G3P) and then to glycerol.
The problem is complicated by the need to control the carbon flux away from glycerol by deletion or decrease of certain enzyme activities, especially glycerol kinase and glycerol dehydrogenase which respectively catalyze the conversion of glycerol plus ATP to G3P and glycerol to dihydroxyacetone (or glyceraldehyde).

Method used

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  • Method for the production of glycerol by recombinant organisms

Examples

Experimental program
Comparison scheme
Effect test

example 1

Production of Glycerol from E. coli Transformed with G3PDH Gene

Media

[0113] Synthetic media was used for anaerobic or aerobic production of glycerol using E. coli cells transformed with pDAR1A. The media contained per liter 6.0 g Na2HPO4, 3.0 g KH2PO4, 1.0 g NH4Cl, 0.5 g NaCl, 1 mL 20% MgSO40.7H2O, 8.0 g glucose, 40 mg casamino acids, 0.5 ml 1% thiamine hydrochloride, 100 mg ampicillin.

Growth Conditions

[0114] Strain AA200 harboring pDAR1A or the pTrc99A vector was grown in aerobic conditions in 50 mL of media shaking at 250 rpm in 250 mL flasks at 37° C. At A600 0.2-0.3 isopropylthio-β-D-galactoside was added to a final concentration of 1 mM and incubation continued for 48 h. For anaerobic growth samples of induced cells were used to fill Falcon #2054 tubes which were capped and gently mixed by rotation at 37° C. for 48 h. Glycerol production was determined by HPLC analysis of the culture supernatants. Strain pDAR1A / AA200 produced 0.38 g / L glycerol after 48 h under anaerobic co...

example 2

Production of Glycerol from E. coli Transformed with G3P Phosphatase Gene (GPP2)

Media

[0115] Synthetic phoA media was used in shake flasks to demonstrate the increase of glycerol by GPP2 expression in E. coli. The phoA medium contained per liter: Amisoy, 12 g; ammonium sulfate, 0.62 g; MOPS, 10.5 g; Na-citrate, 1.2 g; NaOH (1 M), 10 mL; 1 M MgSO4, 12 mL; 100× trace elements, 12 mL; 50% glucose, 10 mL; 1% thiamine, 10 mL; 100 mg / mL L-proline, 10 mL; 2.5 mM FeCl3, 5 mL; mixed phosphates buffer, 2 mL (5 mL 0.2 M NaH2PO4+9 mL 0.2 M K2HPO4), and pH to 7.0. The 100× traces elements for phoA medium / L contained: ZnSO4.7H2O, 0.58 g; MnSO4.H2O, 0.34 g; CuSO4.5H2O, 0.49 g; CoCl2.6H2O, 0.47 g; H3BO3, 0.12 g, NaMoO4.2H2O, 0.48 g.

Shake Flasks Experiments

[0116] The strains pAH21 / DH5α (containing GPP2 gene) and pPHOX2 / DH5α (control) were grown in 45 mL of media (phoA media, 50 ug / mL carbenicillin, and 1 ug / mL vitamin B12) in a 250 mL shake flask at 37° C. The cultures were grown under aerobic ...

example 3

Production of Glycerol from D-Glucose Using Recombinant E. coli Containing Both GPP2 and DAR1

[0117] Growth for demonstration of increased glycerol production by E. coli DH5α-containing pAH43 proceeds aerobically at 37° C. in shake-flask cultures (erlenmeyer flasks, liquid volume ⅕th of total volume).

[0118] Cultures in minimal media / 1% glucose shake-flasks are started by inoculation from overnight LB / 1% glucose culture with antibiotic selection. Minimal media are: filter-sterilized defined media, final pH 6.8 (HCl), contained per liter: 12.6 g (NH4)2SO4, 13.7 g K2HPO4, 0.2 g yeast extract (Difco), 1 g NaHCO3, 5 mg vitamin B12, 5 mL Modified Balch's Trace-Element Solution (the composition of which can be found in Methods for General and Molecular Bacteriology (P. Gerhardt et al., eds, p. 158, American Society for Microbiology, Washington, D.C. (1994)). The shake-flasks are incubated at 37° C. with vigorous shaking for overnight, after which they are sampled for GC analysis of the su...

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Abstract

Recombinant organisms are provided comprising genes encoding a glycerol-3-phosphate dehydrogenase and / or a glycerol-3-phosphatase activity useful for the production of glycerol from a variety of carbon substrates. The organisms further contain disruptions in the endogenous genes encoding proteins having glycerol kinase and glycerol dehydrogenase activities.

Description

FIELD OF INVENTION [0001] This application is a divisional of U.S. application Ser. No. 09 / 695,786, which is a divisional of U.S. application Ser. No. 08 / 982,783 filed 3 Dec. 1997 (now abandoned), which is a continuation-in-part of U.S. application Ser. No. 08 / 968,418 filed 12 Nov. 1997, (now abandoned), claiming benefit to U.S. Provisional Application No. 60 / 030,602, filed 13 Nov. 1996. [0002] The present invention relates to the field of molecular biology and the use of recombinant organisms for the production of glycerol and compounds derived from the glycerol biosynthetic pathway. More specifically the invention describes the construction of a recombinant cell for the production of glycerol and derived compounds from a carbon substrate, the cell containing foreign genes encoding proteins having glycerol-3-phosphate dehydrogenase (G3PDH) and glycerol-3-phosphatase (G3P phosphatase) activities where the endogenous genes encoding the glycerol-converting glycerol kinase and glycerol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12P7/20C12N9/04C12N9/16C12N15/09C12N1/15C12N1/19C12N1/21C12N5/10C12N15/53C12N15/67
CPCC12P7/20C12N15/52C12N15/67
Inventor NAIR, RAMESHPAYNE, MARKTRIMBUR, DONALDVALLE, FERNANDO
Owner NAIR RAMESH
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