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Cyanobacteria modified by gene engineering and use thereof for producing ethanol

A technology of cyanobacteria and bacterium Synechocystis, which can be used in genetic engineering, plant genetic improvement, application, etc., and can solve the problem of insufficient ethanol production concentration.

Inactive Publication Date: 2011-12-28
旭利尔生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] c. The concentration of ethanol production is not high enough

Method used

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  • Cyanobacteria modified by gene engineering and use thereof for producing ethanol
  • Cyanobacteria modified by gene engineering and use thereof for producing ethanol
  • Cyanobacteria modified by gene engineering and use thereof for producing ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Specific operation: the wild Synechocystis sp. 6803 was inoculated in the photosynthetic bioreactor group (consisting of six 150ML shake flasks built in a modified shaker, and the working solution was 50ML), and it was cultured by BG-11 culture medium, and the shaker had a built-in light source , the light intensity on the surface of the reactor is about 200Einstein / m 2 / s. The temperature of the shaker was regulated below 30 °C and the speed was 200 RPM. After 5 days, put them into a hot water bath box to heat and heat shock. Then put it back into the photosynthetic bioreactor at 30°C, and after the complete "whitening" phenomenon occurs (about 3 days), centrifuge the Synechocystis 6803 cells, discard the supernatant, and use fresh BG-11 culture medium to cultivate " albino" of Synechocystis 6803 cells. Synechocystis cells adapted to the heat shock will regenerate chlorophyll, thereby restoring photosynthesis and growth. At the same time, the metabolic mechanism of...

Embodiment 2

[0051] Embodiment 2: pyruvate decarboxylase gene pdc and nirA promoter design

[0052] By the method of bioinformatics, be easy to obtain the sequence of pyruvate decarboxylase gene pdc and nirA promoter (the inventor of the present invention uses the search engine http: / / www.kegg.com / that Japanese Kyoto Encyclopedia of Genes and Genomes provides The sequences of the pyruvate decarboxylase gene pdc and the nirA promoter were obtained). Pdc (sequence number: 1) and nirA (sequence number: 2) can be obtained by artificial synthesis in turn (Roy, et al. European Journal of Biochemistry.191 (3): 647-652, 1990; Shabalina, et al. Nucleic Acids Res. 34: 2428-2437, 2006; Satya et al. Proc IEEE Comput Soc Bioinform Conf. 2: 294-305, 2003; Kim, et al. Gene. 199: 293-301, 1997). The sequence obtained above was analyzed by the Sanger method (F. Sanger, Science, 214, 1215, 1981) to confirm the base sequence.

Embodiment 3

[0053] Embodiment 3: Transformation of Synechocystis mutant strain S.strictus with pdc gene

[0054] A pair of PCR primers P1 (sequence number: 4) and P2 (serial number: 5):

[0055] P1 (5-terminal primer): 5'-GGAGTAAG CATATG AGTTATACTG-3'

[0056] Nd

[0057] P2 (3' end primer): 5'-GGATCTCGACTCTAGA GGATCC -3'

[0058] BamHI

[0059] Among them, a NdeI restriction site was designed for primer P1, and its sequence was CA↓TATG, and a BamHI restriction site was designed for primer P2, and its sequence was GGATC↓C. A pdc DNA fragment P of 1410 bp was amplified by conventional PCR amplification method. PCR reaction: add in 0.5mL sterile centrifuge tube successively: deionized water 36μl; 10XTaq enzyme buffer 5μl; 4XdNTP (2.5mmol / L) 5μl; P1 primer 1μl; P2 primer 1μl; ) 1 μl; Taq enzyme (3U / μl) 1 μl. A total of 50 μl.

[0060] Thermal cycle parameters of PCR reaction: first, 94°C pre-denaturation for 5 minutes; ...

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Abstract

The invention relates to the technical field of biological energy source, in particular to a cyanobacteria synechocystis mutant, a method for screening the synechocystis mutant, a plasmid expression vector introduced with a promoter sequence which is encoded with pyruvate decarboxylase polynucleotide and / or is inducted by nitrate, the synechocystis mutant introduced with the promoter sequence which is encoded with the pyruvate decarboxylase polynucleotide and / or is inducted by the nitrate, and the application of the mutant to prepare ethanol.

Description

technical field [0001] The present invention relates to the technical field of bioenergy, in particular to a cyanobacteria Synechocystis mutant strain, a method for screening a cyanobacteria Synechocystis mutant strain, introducing a polynucleotide encoding pyruvate decarboxylase and / or a nitrate-induced promoter The plasmid expression vector of the sequence, the above-mentioned Synechocystis mutant strain introduced with the polynucleotide encoding pyruvate decarboxylase and / or the promoter sequence induced by nitrate, and the application of the above-mentioned mutant strain in the preparation of ethanol. Background technique [0002] Since the Industrial Revolution in Britain more than 250 years ago, the development of human society has been closely related to the use of energy. With the continuous development of the global economy, the development and use of fossil energy mainly oil, coal and natural gas have become increasingly prominent: First, oil, coal and natural gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/13C12N15/60C12P7/06
CPCY02E50/17Y02E50/10
Inventor 黄娟
Owner 旭利尔生物技术有限公司
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