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A method for producing recombinant mixed l-arabinose isomerase

An arabinose and isomerase technology, applied in the biological field, can solve the problems that affect the development of D-tagatose industry and have not yet discovered L-arabinose isomerase

Inactive Publication Date: 2016-06-29
INST OF TROPICAL BIOSCI & BIOTECH CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a variety of microorganisms have the function of producing L-arabinose isomerase, so far no L-arabinose isomerase that meets the optimum pH 5.0-6.0 and optimum temperature > 60°C has been found, which affects the use Development of D-tagatose Production by L-Arabinose Isomerase

Method used

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  • A method for producing recombinant mixed l-arabinose isomerase
  • A method for producing recombinant mixed l-arabinose isomerase
  • A method for producing recombinant mixed l-arabinose isomerase

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Embodiment 1

[0019] 1.1 Construction of the L-arabinose isomerase gene expression framework containing Thermotoga neoapollinum, the L-arabinose isomerase gene expression framework of Bacillus stearothermophilus and the L-arabinose isomerase gene of Escherichia coli Expression framework for Pichia expression vector

[0020] 1.1.1 Construction of cloning vector

[0021] A professional DNA sequence synthesis company synthesizes two base complementary double strands containing ampicillin (AMP) gene sequence, polyclonal adapter and E. coli replication origin, and forms cohesive ends at both ends of each DNA strand sequence. It is circularized by the action of DNA ligase to form a DNA cloning vector. The cloning vector was named pPL.

[0022] 1.1.2 Acquiring genes

[0023] ①PCR amplification of the L-arabinose isomerase gene of Thermotoga neoapollianus

[0024] Primer 1:

[0025] 5'cc GAATTC atgatcgatctcaaacagtat3'[Description: The 8 bases of 5' are the restriction enzyme protection bases ...

Embodiment 2

[0081] 2.1 Construction of the L-arabinose isomerase gene expression framework containing Thermotoga neoapollinum, the L-arabinose isomerase gene expression framework of Bacillus stearothermophilus and the L-arabinose isomerase gene of Escherichia coli Expression framework for Pichia expression vector

[0082] 2.1.1 Construction of cloning vector

[0083] A professional DNA sequence synthesis company synthesizes two base complementary double strands containing ampicillin (AMP) gene sequence, polyclonal adapter and E. coli replication origin, and forms cohesive ends at both ends of each DNA strand sequence. It is circularized by the action of DNA ligase to form a DNA cloning vector. The cloning vector was named pPL.

[0084] 2.1.2 Acquiring genes

[0085] ①PCR amplification of the L-arabinose isomerase gene of Thermotoga neoapollianus

[0086] Primer 1:

[0087] 5'cc GAATTC atgatcgatctcaaacagtat3'[Description: The 8 bases of 5' are the restriction enzyme protection bases ...

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Abstract

The invention discloses a method for producing recombinant mixed L-arabinose isomerase and belongs to the field of biological technology. The method comprises the steps of: first, cloning L-arabinose isomerase genes of bacillus stearothermophilus, thermotoga neapolitana and escherichia coli; constructing a pichia pastoris expression vector containing expression frameworks of the three L-arabinose isomerase genes and converting the vector into pichia pastoris to obtain engineering bacteria; and fermenting the pichia pastoris engineering bacteria to produce the recombinant mixed L-arabinose isomerase. The recombinant mixed enzyme has much higher enzymatic activity than a single enzyme with pichia pastoris as an expression vector, and has high enzymatic activity for isomerizing D-galactose into D-tagatose at a pH of 6.0 and at a temperature of 80 DEG C, which meet the production condition of isomerizing D-galactose into D-tagatose. The method provided by the invention is conducive to the solution of the problem that development of the industry of producing D-tagatose by an enzymic method is constrained as there is no L-arabinose isomerase that meets the requirements of an optimum pH of 5.0-6.0 and an optimum temperature of above 45 DEG C to produce bacterial strains, and thus helps promote the industry of producing D-tagatose by an enzymic method.

Description

technical field [0001] The invention belongs to the field of biotechnology and relates to the construction of microbial engineering bacteria to produce recombinant proteins. Specifically, the recombinant mixed L-arabinose isomerase is produced by using microbial engineering bacteria. Background technique [0002] L-arabinose isomerase (L-arabinoseisomerase EC5.3.1.4) is an enzyme produced by microorganisms with allosteric effects. L-arabinose isomerase can catalyze L-arabinose to L-ribulose; due to the structural similarity between L-arabinose and D-galactose, L-arabinose isomerase can also catalyze D-galactose Isomerized to D-tagatose. D-tagatose is a sweetener with low-energy, blood sugar-lowering and anti-caries properties. Although a variety of microorganisms have the function of producing L-arabinose isomerase, the current tagatose products are still mainly derived from chemical synthesis. The process of chemically synthesizing D-tagatose is complicated, the product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N15/61C12N15/81C12N1/19C12N9/90C12P19/24C12R1/84
Inventor 张爱联尹慧祥陈丽萍崔艳艳张添元
Owner INST OF TROPICAL BIOSCI & BIOTECH CHINESE ACADEMY OF TROPICAL AGRI SCI
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