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Application of sll0528 genes to improvement of ethanol tolerance of synechocystis PCC6803

A technology of PCC6803 and Synechocystis, applied in the field of industrial microorganisms, can solve the problems of poor ethanol tolerance and the production of bioethanol cannot meet the requirements of industrial production, and achieve the effect of wide application prospects

Active Publication Date: 2019-05-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But so far the production of bioethanol is far from meeting the requirements of industrial production, one of the important reasons is the poor tolerance of Synechocystis PCC6803 to ethanol

Method used

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  • Application of sll0528 genes to improvement of ethanol tolerance of synechocystis PCC6803
  • Application of sll0528 genes to improvement of ethanol tolerance of synechocystis PCC6803
  • Application of sll0528 genes to improvement of ethanol tolerance of synechocystis PCC6803

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Homologous recombination double crossover plasmid PET-Cm r and a build of P3031:

[0040] (1) Amplification of the insert:

[0041]Using the wild-type Synechocystis PCC6803 genome as a template, using SEQ ID NO: 1 and SEQ ID NO: 2 in the sequence table as the upstream and downstream primers of the gene sll0528 to be knocked out, SEQ ID NO: 3 and SEQ ID NO: 4 The upstream and downstream primers for the downstream of the gene sll0528 to be knocked out were amplified by PCR to obtain the upstream fragment sll0528-up and the downstream fragment sll0528-down of the gene sll0528 to be knocked out. Using the plasmid pACYC184 as a template and using SEQ ID NO: 5 and SEQ ID NO: 6 as upstream and downstream primers, the fragment Cm containing the chloramphenicol resistance gene was amplified by PCR r ; With wild-type Synechocystis PCC6803 genome as a template, with SEQ ID NO: 7 and SEQ ID NO: 8 in the sequence listing as the upstream and downstream primers of the target fragmen...

Embodiment 2

[0047] Obtaining of sll0528 gene knockout strain Δsll0528 and sll0528 gene overexpression strain Osll0528

[0048] (1) Plasmid transformation

[0049] Homologous recombination double exchange plasmid PET-Cm r After filtering and sterilizing with a 0.22 μm microporous membrane, put it into a 2 mL sterile centrifuge tube. A certain amount of BG11 medium (with HEPES buffer added) was added thereto, so that the final concentration of the plasmid was about 10 ng / μL. Take 30 mL of wild-type PCC6803 in logarithmic phase, centrifuge at 6000 rpm for 7 min, and remove the supernatant. Resuspend the algae mud with 20mL of fresh BG11 medium, centrifuge at 6000rpm for 7min, and remove the supernatant. Resuspend the algae mud with plasmid-containing medium. The resuspended algae liquid was cultured at 29°C, 150rpm, and 1400Lux continuous light for 6h. Apply the algae liquid to the solid medium covered with mixed fiber filter membrane and culture it under light for 1 day (upright cultur...

Embodiment 3

[0057] Phenotype analysis of Synechocystis sp. PCC6803 wild type, gene knockout strain Δsll0528, and gene overexpression strain Osll0528 under ethanol stress:

[0058] The wild type grown to the logarithmic phase, Δsll0528, Osll0528 was used as seed solution, and was inoculated to contain 0% (v / v), 1.5% (v / v), 2.0% (v / v), 2.5% (v / v) respectively. v), the starting OD of each bottle of algae in 50mL BG11 medium of 3.0% (v / v) ethanol 730 = 0.1. Continuous culture for 4 days, sampling OD every day 730 value to draw a growth curve. The culture conditions are 30° C., 150 rpm, 1800 Lux continuous light, and the experimental group and the control group have three parallels.

[0059] Figure 3-6 It is the growth curve of Synechocystis PCC6803 wild-type WT, Δsll0528 and Osll0528 strains under 1.5%, 2.0%, 2.5%, 3.0% (v / v) ethanol stress, and E in the figure represents ethanol. It can be seen from the figure that the growth state of Osll0528 was significantly better than that of the ...

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Abstract

The invention discloses an application of sll0528 genes to improvement of ethanol tolerance of synechocystis PCC6803, and belongs to the field of industrial microorganisms. Through a homologous reorganization method, the sll0528 genes in the synechocystis PCC6803 are knocked out and overexpressed, so that a synechocystis PCC6803 algae strain Osll0528 with notable improvement of ethanol tolerance is obtained. In a BG11 culture medium of ethanol of different concentrations (1.5%, 2.0%, 2.5% and 3.0%v / v), the growth state of the algae strain is obviously higher than that of wild algae strains. The obtained algae strains being tolerant to ethanol have important theory and actual significance in genetic engineering bacteria for producing ethanol as fuel, and have broad application prospects.

Description

technical field [0001] The invention belongs to the field of industrial microorganisms, and in particular relates to the application of a sll0528 gene in improving ethanol tolerance of Synechocystis sp. PCC6803. Background technique [0002] The energy crisis and the increasing environmental pollution and greenhouse effect caused by fossil fuels have aroused people's interest in renewable green biofuels. Bioethanol is a kind of green renewable energy. Its emergence not only reduces the dependence on petroleum resources, but also greatly reduces the emission of carbon dioxide. Cyanobacteria can use carbon dioxide to directly synthesize bioethanol through photosynthesis, which has shown great potential in the production of green fuels in the future. Synechocystis PCC6803, as a photosynthetic cyanobacterium, has been widely used as a genetically engineered bacterium for the development of bioethanol because of its ease of molecular biology operations. [0003] But so far the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/21C12N15/74C12P7/06C12R1/01
CPCC12N15/74C12P7/06C12N1/205C12R2001/01Y02E50/10
Inventor 陈谷许白雪
Owner SOUTH CHINA UNIV OF TECH
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