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Bacillus subtilis LS02 laccase and application thereof

A technology of Bacillus subtilis and spore laccase, which is applied in the field of applied microorganisms, can solve problems such as less bacterial laccase, and achieve the effects of good thermal stability and simple operation.

Inactive Publication Date: 2011-07-06
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been many studies on the application of laccases derived from white rot fungi or other fungi to decolorize dyes, but there are few reports on bacterial laccases and bacterial laccase-mediator systems in dye decolorization

Method used

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  • Bacillus subtilis LS02 laccase and application thereof
  • Bacillus subtilis LS02 laccase and application thereof
  • Bacillus subtilis LS02 laccase and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The property of embodiment 1 bacillus subtilis LS02 spore laccase

[0049] 1. Effect of pH value on activity and stability of spore laccase

[0050] The effect of pH on laccase activity using pH2.2-7.8 citric acid-phosphate buffer (0.1mol / L), pH7.4-9.0Tris-HCl (0.05mol / L) buffer and pH8.6-10.0 glycine -Sodium hydroxide buffer solution (0.05mol / L) is measured, and the influence of pH on the stability of laccase is by the citric acid-phosphate buffer solution of pH3.0,8.0, the Tris of pH9.0 when 30 ℃. -HCl buffer solution and pH 10.0 glycine-sodium hydroxide buffer solution were mixed and placed for 1-10 days to determine the remaining activity. Figure 1-3 It shows that the spore laccase provided by the invention has a wide range of catalysis, and can catalyze the substrate reaction in the scope of pH2.2-10.0. When using ABTS, syringaldazine and 2,6-dimethoxyphenol as substrates The measured pH optimums were 3.0, 6.8 and 7.8, respectively. Figure 4 It showed that the...

Embodiment 2

[0057] Example 2 Bacillus subtilis LS02 spore laccase to the decolorization of synthetic dyes

[0058] 1. The reaction system of the decolorization experiment and the calculation of the decolorization rate

[0059] The experimental reaction system was 6ml, and pH 6.8 citric acid-phosphate buffer (0.1mol / L), dye (see Table 1 for the type and final concentration), Bacillus subtilis LS02 spore laccase (final concentration of 1mg / ml) and acetosyringone (final concentration 0.1mmol / L). At the same time, the reaction system without adding Bacillus subtilis LS02 spore laccase was used as a blank control. Samples were taken regularly, centrifuged at 12000 rpm for 2 minutes, and the absorbance values ​​at the maximum absorption wavelengths (see Table 1) of each dye were measured. All measurements were repeated three times to obtain the average value. Then calculate the dye decolorization rate. The formula for calculating the decolorization rate of the dye is (A 0 -A) / A 0 ×100%, ...

Embodiment 3

[0065] Cloning of embodiment 3 Bacillus subtilis LS02 spore laccase gene

[0066] 1. Cloning of strain laccase gene

[0067] Pick the above strains into 5mL LB liquid medium, culture overnight at 37°C, 200rpm. Genomic DNA of the above strains was extracted according to the instructions of the bacterial genome extraction kit from Omega Company, and detected by 1% agarose gel electrophoresis.

[0068] Genomic DNA was used as a template, and the upstream primer "CGG GGATCC GACACTTGAAAAATTTG" (restriction site BamHI) and downstream primer "CCG CTCGAG TTATTTATGGGGATCAG" (restriction site Xho I) to amplify the laccase gene of Bacillus subtilis LS02 spore.

[0069] Add the following reagents to a 200 μL PCR tube: ddH 2 O 13.75 μL, 10×Ex Taq Buffer 2 μL, 10 mmol / L dNTP mixture 1 μL, 10 μmol / L upstream primer 1 μL, 10 μmol / L downstream primer 1 μL, DNA template 1 μL, Ex Taq enzyme 0.25 μL, total volume 20 μL. A negative control was also set up. PCR reaction conditions: 94°C for...

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Abstract

The invention discloses a preparation method of bacillus subtilis LS02 (CGMCC No.4261) spore laccase, the catalytic property of the spore laccase and application of the spore laccase to decoloring of a dye. The invention also relates to a nucleotide sequence for encoding the spore laccase. The method comprises the following steps of: fermenting bacillus subtilis LS02 on a solid-state sporulation medium at the temperature of 37 DEG C for 5 days; flushing spores with deionized water; and performing a series of treatment such as lysozyme treatment to obtain a spore suspension with laccase activity. The spore laccase has high catalyst activity under alkaline and high temperature conditions, has good decoloring effects on synthetic dyes with different structures under the action of a mediator,and can be applied to treatment of industrial dye waste water.

Description

technical field [0001] The invention relates to a bacterial laccase, in particular to a preparation method and catalytic properties of a spore laccase of Bacillus subtilis LS02, and a nucleic acid fragment encoding the spore laccase. In addition, the invention also relates to a method for decolorizing synthetic dyes by the spore laccase, which belongs to the field of applied microorganisms. Background technique [0002] Laccase (EC 1.10.3.2) is a copper-containing polyphenol oxidase, which can catalyze the oxidation of aromatic compounds of various structures by using copper ions in the active center, and simultaneously reduce molecular oxygen to water. Due to the wide range of substrates catalyzed by laccases, laccases have been widely used in the paper industry, textile industry, food industry, and soil bioremediation. [0003] Laccase-catalyzed oxidation of substrates generally includes two modes of action. The first is that substrate molecules directly react with laccas...

Claims

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Application Information

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IPC IPC(8): C12N1/20C12N9/02C12N15/53C12R1/125
Inventor 赵敏卢磊杜美惠李泰仑赵丽艳王天女李德斌
Owner NORTHEAST FORESTRY UNIVERSITY
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