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Laccase from Bacillus licheniformis LS04 and use thereof

A technology of Bacillus licheniformis and spore laccase, which is applied in the field of applied microorganisms, can solve the problems of less bacterial laccase and the like, and achieve the effect of high activity

Inactive Publication Date: 2011-08-17
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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  • Laccase from Bacillus licheniformis LS04 and use thereof
  • Laccase from Bacillus licheniformis LS04 and use thereof
  • Laccase from Bacillus licheniformis LS04 and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The property of embodiment 1 bacillus licheniformis LS04 spore laccase

[0050] 1. Effect of pH value on activity and stability of spore laccase

[0051] 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 pH3.0,7.0, the Tris of pH9.0 when laccase is mixed at 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 optimum pH values ​​measured were 4.2, 6.6 and 7.0, respectivel...

Embodiment 2

[0060] Example 2 Bacillus licheniformis LS04 spore laccase to the decolorization of synthetic dyes

[0061] 1. The reaction system of the decolorization experiment and the calculation of the decolorization rate

[0062] The experimental reaction system was 6ml, and pH 6.6 citric acid-phosphate buffer (0.1mol / L), dye (see Table 1 for the type and final concentration), laccase of Bacillus licheniformis LS04 (final concentration of 1mg / ml) and acetosyringone (final concentration 0.1mmol / L). At the same time, the reaction system without adding Bacillus licheniformis LS04 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) / ...

Embodiment 3

[0068] Cloning of embodiment 3 Bacillus licheniformis LS04 spore laccase gene

[0069] 1. Cloning of strain laccase gene

[0070] 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.

[0071] Genomic DNA was used as a template, and the upstream primer "CTG CCATGG ATAAACTTGAAAAATTCGTTG" (restriction site Nco I) and downstream primer "CCG CTCGAGTTATTGATGACGAACATCTG" (restriction site Xho I) amplifies the laccase gene of Bacillus licheniformis LS04 spore.

[0072] 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 / 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 con...

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Abstract

The invention discloses preparation, a catalytic property and use in dye decolorizing of spore laccase from Bacillus licheniformis LS04 (CGMCC No.4263). The invention also relates to a nucleotide sequence coding the spore laccase. The invention also relates to a nucleotide sequence for coding the spore laccase. In the invention, Bacillus licheniformis LS04 ferments at 37 DEG C for 5 days on a solid sporulation culture medium, spores are washed off by deionized water, and pore suspension with laccase activity can be obtained by series measures such as lysozyme treatment. The spore laccase has high catalytic activity under alkaline and high-temperature conditions, can maintain high enzyme activity in high-concentration organic solvent and salt solution, has good decolorizing effect on synthesized dyes of different structures under action of an amboceptor and can be used for treating industrial dye waste water.

Description

technical field [0001] The invention relates to a bacterial laccase, in particular to the preparation and catalytic properties of a spore laccase of bacillus licheniformis LS04, 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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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C12N9/02C12N15/53C12R1/10
Inventor 卢磊赵敏李泰仑杜美惠赵丽艳王天女李德斌
Owner NORTHEAST FORESTRY UNIVERSITY
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