Method for regenerating ATP using rationally designed enzyme

A rational polyphosphate kinase technology, applied in biochemical equipment and methods, enzymes, transferases, etc., can solve problems such as inability to couple enzymes at room temperature, high degree of polyphosphate polymerization, and difficulty in obtaining polyphosphate. To achieve the effect of cost reduction

Active Publication Date: 2016-06-01
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

For example, the polyphosphokinase TePpk derived from Thermotogamaritima is a thermophilic enzyme. Its optimum temperature is 70 degrees, which is suitable for participating in reactions with higher temperatures. The enzyme activity is low, and it cannot be coupled with room temperature enzymes, so it cannot widely meet the needs of industrial production
There are also some polyphosphate kinases. Although the optimum temperature is about 30 degrees, the polyphosphate used has

Method used

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  • Method for regenerating ATP using rationally designed enzyme
  • Method for regenerating ATP using rationally designed enzyme

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Effect test

Embodiment 1

[0026] Mutation and cloning of rationally designed polyphosphate kinase gene from Sinorhizobium meliloti

[0027] The polyphosphokinase gene ppk from Sinorhizobium meliloti was mutated into ppk(ket) by site-directed mutagenesis. Using the strain's original gene recombination vector as a template, design primers according to the GenBank sequence, and operate according to the instructions of the TaKaRaMutanBESTkit kit.

[0028] The primers used for site-directed mutagenesis are as follows:

[0029] F1:GCGATCAAAGCGACGACGGAAAATATGAACCCCCGCTC

[0030] R1: ACCACCCTTGCCGGCAGCGT

[0031] F2: GCGCGCACCGTCGCACTGACGAAACCGA

[0032] R2: GGAGCGGGGGTTCATATT

[0033] The size of the mutated recombinant vector fragment is about 6000bp, see the nucleic acid electrophoresis figure 1 .

Embodiment 2

[0035] Transform the constructed expression vector, pET22b-ppk (ket) plasmid, into BL21 (DE3) Escherichia coli, use LB medium after picking the bacteria, and grow at 37°C until the OD600 is about 0.4-1.0, then add 0.1mM-1mM Induced by IPTG, intracellular expression was performed at 30°C. The vector pET22b was transformed into BL21(DE3) Escherichia coli, and the expression was induced and expressed under the same conditions as above, and the expressed crude enzyme solution was subjected to protein electrophoresis to verify the expression results. The protein electrophoresis was as follows: figure 2 As shown, the protein content measured by Coomassie brilliant blue method was 8.4g / L.

Embodiment 3

[0037] The kinetic parameters of PPK enzyme were measured when tetrapolyphosphate was used as substrate. Six groups of experimental systems 1 numbered 1, 2, 3, 4, 5, and 6 were set up, and the concentrations of tetrapolyphosphate in the system were 2mM, 4mM, 8mM, 10mM, 15mM, and 20mM, respectively. Add ADP corresponding to twice the concentration of hexametaphosphate, 30mM MgCl 2 , 200ul of PPK crude enzyme solution (containing 0.12mg of protein), adding different amounts of 3M pH8.0 Tris-HCl to adjust the pH of the system to 8.0, system 1 was reacted at 37 degrees for 5 minutes and then placed in a 60 degrees water bath for 20 minutes to inactivate the PPK enzyme. Take the corresponding supernatant and add it to NADPH reaction system 2, marked as 1, 2, 3, 4, 5, 6. The corresponding glucose concentration of each group in system 2 is 1mM, 2mM, 3mM, 4mM, 5mM, 7mM glucose and NADP, and the amount of hexokinase and glucose-6-phosphate dehydrogenase in the corresponding numbered e...

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Abstract

The invention relates to a method for regenerating ATP using a rationally designed enzyme. Through rational design after sequence alignment, polyphosphate kinase from sinorhizobium meliloti is mutated and heterologously expressed; and under the catalysis of the polyphosphate kinase, the regeneration of ATP is realized by adopting polyphosphate with low polymerization degree as a phosphoric acid donor. Compared with existing ATP regeneration method, the polyphosphate kinase used in the invention is a normal-temperature enzyme which can react for coupling with multiple enzymes; the enzyme can take tetra-polyphosphate as a phosphoric acid donor; compared with phosphoric acid with high polymerization rate, the tetra-polyphosphoric acid is more common and easily available; and the feasibility of ATP regeneration is increased on the basis of simplifying the ATP regeneration process, and the cost of ATP regeneration is reduced. The activity of PPK enzyme is not inhibited by the polyphosphate concentration, and industrial large-scale production is possible.

Description

technical field [0001] The invention belongs to the field of biochemical industry, in particular to a method for regenerating ATP with a rationally designed enzyme. Background technique [0002] ATP is the most important high-energy phosphate compound in the body, and it is widely used in medicine as a treatment or an important auxiliary treatment drug for muscle atrophy, myocardial infarction, hepatitis and various emergency diseases. There are also many biosynthetic processes of important bioactive substances or biochemical drugs in industry, which are also enzymatic reactions that require ATP to participate. Therefore, the production of ATP and the recycling of ATP in industry have become an important issue in the development of enzyme engineering, and are the key factors to determine whether industrial production is economical. [0003] In recent years, the research on ATP regeneration is mainly based on the method catalyzed by polyphosphate kinase, that is, ADP and pol...

Claims

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Application Information

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IPC IPC(8): C12P19/32
CPCC12N9/1229C12P19/32C12Y207/04001
Inventor 刘珞李成成曹浩
Owner BEIJING UNIV OF CHEM TECH
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