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Preparation method of gene-encoded whole protein catenane

A protein and catenane technology, applied in the direction of animal/human protein, p53 protein, mammalian protein, etc., can solve the problem of not preparing molecular weight recombinant protein catenane, and achieve the effect of reducing difficulty

Active Publication Date: 2018-10-16
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there have been no reports on the preparation of recombinant protein catenanes with larger molecular weights.

Method used

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  • Preparation method of gene-encoded whole protein catenane
  • Preparation method of gene-encoded whole protein catenane
  • Preparation method of gene-encoded whole protein catenane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Construction of AEXEB and EAXEB fusion protein plasmids and expression in Escherichia coli

[0043] The AEXEB sequence constructed in this example is shown as SEQ ID No: 7 in the sequence table, wherein the 14th to 26th positions are A, the 29th to 108th positions and 151 to 230 are E, the 111th to 148th positions are X, and the 111th to 148th positions are X. 233-359 are B, and 237-243 are TEV restriction sites.

[0044] The EAXEB sequence constructed in this example is shown as SEQ ID No: 8 in the sequence table, wherein the 96th to 108th positions are A, the 14th to 93rd positions and 154 to 233 are E, the 114th to 151st positions are X, and the 114th to 151st positions are X. 238-364 are B, and 242-248 are TEV restriction sites.

[0045] The gene sequence of the above fusion protein was introduced into the vector pQE-80L, and then transformed into Escherichia coli.

[0046] Expressed in E. coli BL21(DE3). Before large-scale expression, the transformed ...

Embodiment 2

[0047] Example 2: Construction of AXB and BXA fusion protein plasmids and expression in Escherichia coli

[0048] The AXB sequence constructed in this example is shown as SEQ ID No: 9 in the sequence table, wherein the 16th to 28th are A, the 33rd to 70th are X, the 77th to 203rd are B, and the 81st to 87th are TEV restriction site.

[0049] The BXA sequence constructed in this example is shown as SEQ ID No: 10 in the sequence listing, where the 17th to 143rd is B, the 21st to 27th is the TEV restriction site, the 156th to 193rd is X, and the 199th ~211 bits are A.

[0050] The above protein sequence is constructed in the pQE-80L expression vector. Subsequently expressed in E. coli BL21(DE3). Before large-scale expression, the transformed monoclonal bacteria were first inoculated in 5 mL 2×YT medium (containing 100 μg / mL ampicillin), cultured overnight at 37°C with shaking at 250 rpm, and transferred to In 1L of fresh 2×YT medium (in a 3L Erlenmeyer flask, containing 100μg...

Embodiment 3

[0051] Example 3: Purification of AEXEB and EAXEB Catalane Proteins by Nickel Affinity Chromatography Column

[0052] Collect 1L of Escherichia coli culture solution in a centrifuge bottle, collect the bacteria by centrifugation at 5000g, and remove the supernatant culture solution. Resuspend the bacteria with 40mL denaturing buffer solution A (20mM disodium hydrogen phosphate, 500mM sodium chloride, 25mM imidazole, 8M urea, pH=8.0) containing 2% Tween 20 and 1mM phenylmethylsulfonyl fluoride, and then use The sonicator disrupted the cells at 4°C, and then centrifuged the Escherichia coli crushed product at 4°C under a centrifugal force of 28000g for 20 minutes. The resulting supernatant was mixed with the nickel-affinity resin equilibrated with denaturing buffer solution A, and stirred at 4°C for 1 h. The mixture was placed in an empty column and eluted by gravity flow. The eluent was denaturing buffer solution B (20 mM disodium hydrogen phosphate, 500 mM sodium chloride, 8 ...

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Abstract

The invention discloses a preparation method for genetically coded holoprotein catenane. Protein monomer molecules are intertwined with one another by a protein interlocking structure unit and are cyclized by protein reaction pairs similar to disk label-disk catcher coupling reaction pairs to form catenane; firstly, a coding gene which includes the protein reaction pairs and corresponds to a recombined protein of the protein interlocking structure unit is constructed, introduced into a vector plasmid and expressed in a cell to purify an expression protein to obtain protein catenane. By use of a gene coding form, the proteins with the catenane structures are obtained more efficiently in a cell body; therefore the difficulty in preparation of the protein catenane can be reduced to the maximum extent, and active proteins with stable functions can be obtained.

Description

technical field [0001] The invention relates to the preparation of biological macromolecules, in particular to a preparation method for expressing protein catenane in vivo. Background technique [0002] Catalanes are supramolecules composed of interlocking molecules with a special mechanical interlocking structure, and have received extensive attention in the field of supramolecules. In the supramolecular field, there are generally two methods for preparing catenanes: one is to use the possibility of molecules intertwining and forming rings to synthesize, this method based on statistics often has low yield and poor controllability; The first is to use non-covalent interactions to pre-assemble molecules, which can obtain target products with higher yields (Gil-Ramirez, G.; Leigh, D.A.; Stephens, A.J.Angew.Chem.Int.Ed.2015,54, 6110-6150.). [0003] Compared with catanes in supramolecules, the special properties of protein catenanes are more focused on the improvement of stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K14/47C12N15/63
CPCC07K14/4746
Inventor 张文彬王晓威刘栋
Owner PEKING UNIV
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