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Method for synthesizing pseudouridine by chemical enzyme method

A chemical enzymatic method, pseudouridine technology, applied in the directions of biochemical equipment and methods, botanical equipment and methods, enzymes, etc., can solve the problems of long synthesis steps, low yield, complicated purification process, etc., and achieve short reaction time. , the effect of high conversion rate and simple purification process

Pending Publication Date: 2022-03-18
武汉糖智药业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems of long synthesis steps, low yield, and the use of more flammable and explosive reagents in the synthesis of chemical methods, and the problems of long cultivation period and complicated purification process in the synthesis of Escherichia coli engineering bacteria, it is necessary to find a chemical-enzyme A method for synthesizing pseudouridine by promoting reaction, through a simple reaction, a large amount of pseudouridine can be produced at a lower cost

Method used

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  • Method for synthesizing pseudouridine by chemical enzyme method
  • Method for synthesizing pseudouridine by chemical enzyme method
  • Method for synthesizing pseudouridine by chemical enzyme method

Examples

Experimental program
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Embodiment 1

[0025] Embodiment 1 Chemical Synthesis of Ribose-5-Phosphate

[0026] Dissolve 50g of AMP in 3L of 1M HCl, heat to 100°C, and stir for 1h. Then cool down to room temperature, adjust the pH of the system to 8.2 with a saturated KOH solution, add isopropanol to precipitate a precipitate, which is the crude ribose-5-phosphate. Add the crude ribose-5-phosphate solution to the ion exchange resin, use 0.2, 0.4, 0.6, 0.8 and 1.0M chloroacetic acid solution to elute, purify to obtain a purified ribose-5-phosphate solution, and freeze-dry to obtain 30g ribose-5- phosphoric acid. The ribose-5-phosphate was 85% pure as determined using HPLC equipped with an evaporative light scattering detector.

[0027] The detection method of ribose-5-phosphate is as follows:

[0028] Chromatographic column: Waters XBridge BEH Amide, 250×4.6mm, 5μm;

[0029] Column temperature: 40°C;

[0030] Flow rate: 1mL / min;

[0031] Mobile phase A: acetonitrile;

[0032] Mobile phase B: 2g / L ammonium acetat...

Embodiment 2

[0035] Expression, purification and mutation of embodiment 2 pseudouridine-5-phosphoglucosidase

[0036] 1) Expression and purification of pseudouridine-5-phosphoglucosidase

[0037] Pseudouridine-5-phosphoglucosidase is derived from Dorea formicigenerns ATCC 27755, which is codon-optimized pseudouridine-5-phosphoglucosidase for Escherichia coli, and its two ends use NdeI and XhoI restriction sites respectively. Use restriction endonucleases NdeI and XhoI to digest the target gene and pET-28a plasmid, recover the target gene fragment and vector fragment by agarose gel electrophoresis, use T4 DNA ligase to carry out the ligation reaction, and transform Escherichia coli DH5α competent , coated plate with kanamycin added. After picking a single clone for colony PCR verification, select the successfully connected strain to extract the plasmid for sequencing to verify the accuracy of the target fragment sequence.

[0038] After transforming the BL21(DE3) strain with the correctly...

Embodiment 3

[0043] Embodiment 3 synthetic pseudouridine monophosphate

[0044] 1) synthesis

[0045] Weigh 220.8g ribose-5-phosphate, 4.8g MnCl 2 4H 2 O, dissolve it using 5 L of deionized water. Weigh 53.7g of uracil again, and dissolve it with 4.8L of deionized water (heating to 80°C helps dissolve).

[0046]Pour the prepared two solutions into a 20L reactor, set the stirring speed at 150rpm, the temperature at 37°C, and the pH at 7.5. When the temperature rises to 37°C and the pH is 7.5 (±0.05), respectively add pseudouridine-5-phosphoglucosidase and its mutants at a final concentration of 0.5 mg / ml, and use 2M NaOH solution to automatically adjust the pH. After reacting for 30 minutes, slowly add 4.8 L of 100 mM completely dissolved uracil solution. After 2 hours, take 500 μL samples every 30 minutes and heat in a boiling water bath for 10 minutes, centrifuge and take the supernatant for dephosphorylation treatment and HPLC detection, as shown in figure 1 As shown, the reaction ...

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Abstract

The invention discloses a method for synthesizing pseudouridine by a chemical enzyme method, which comprises the following steps: synthesizing pseudouridine monophosphate from ribose-5-phosphoric acid and a pseudouridine-5-phosphosidase mutant, and carrying out dephosphorylation and separation to obtain pseudouridine. The amino acid sequence of the pseudouridine-5-phosphosidase mutant is as shown in SEQ ID NO: 1. According to the method, the pseudouridine is synthesized through chemical-enzymatic reaction, mass production of the pseudouridine is realized through simple reaction and low cost, and the application of industrial synthesis of the pseudouridine is promoted.

Description

technical field [0001] The invention relates to the technical field of pseudouridine synthesis, in particular to a method for synthesizing pseudouridine by chemical enzymatic method. Background technique [0002] In the middle of the last century, researchers discovered that there is an isomer similar in structure to uridine nucleoside in ribosomal RNA (ribosomal RNA, rRNA) and transfer RNA (transfer RNA, tRNA), and its ribose is not related to uracil ( uracil, U) is connected to N1, but to C5 to form pseudouridine (pseudouridine, ψ), which is referred to as pseudouridine for short. In organisms, the uridine on the RNA cleaves the C-N bond between the ribose and the base through pseudouridine synthase and reconnects to form a C-C bond, isomerizing into pseudouridine, and the structural formula of pseudouridine is as shown in formula (I) Show. [0003] [0004] Subsequent studies have found that non-coding RNAs with high intracellular abundance, such as snRNA, are rich i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/38C12N9/90C12N15/61
CPCC12P19/385C12N9/90C12Y504/99
Inventor 肖聪吴结缘
Owner 武汉糖智药业有限公司
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