Preparation method of insulin glargine and analogue thereof

An insulin analog, insulin glargine technology, applied in the field of preparation of insulin glargine and its analogs, can solve the problems of low yield, high cost, low separation yield and the like, and achieves high yield, simple method and application wide range of effects

Active Publication Date: 2012-12-12
SHANGHAI HUAYI BIO LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the theoretical yield of the two structures formed after the precursor is transpeptidized is 50% each, and the structures are relatively consistent, and the separation yield is low.
The reaction conditions of Arg introducing protec

Method used

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  • Preparation method of insulin glargine and analogue thereof
  • Preparation method of insulin glargine and analogue thereof
  • Preparation method of insulin glargine and analogue thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: Utilize Escherichia coli expression system to construct genetically engineered bacteria

[0052] The preferred codons of Escherichia coli were selected, and the gene fragment expressing the insulin glargine precursor was obtained by fusion PCR technology, and the translated amino acid sequence was F V N Q H L CG S H L V E A L Y L V C G E R G F F YT P K T R R K E A E D L Q V G Q V E LG G G P G A G S L Q P L A L E G S L QR K G I V E Q C C T S I C S LY Q L EN Y C G, in order to improve the expression amount and renaturation efficiency , a piece of protein is fused at the N-terminus to connect with the connecting peptide GSK. The fusion sequence selected in this embodiment is a piece of staphylococcal protein A (SPA), M A D N K F N K E Q Q N A F Y E I LH L P N L N E E Q R N G F I Q S L K DD P S Q S A N L L A E A K K L N D AQ A P K A D N K. After introducing the NdeI EcoR I restriction site and connecting it into the expression vector pET 17b, the genetically en...

Embodiment 2

[0053] Example 2: Construction of genetically engineered bacteria using Pichia pastoris expression system

[0054] The preferred codons of Pichia pastoris were selected, and the gene fragment expressing the insulin glargine precursor was obtained by fusion PCR technology, so that the translated amino acid sequence was F V N Q H L CG S H L V E A L Y L V C G E R G F F YT P K T R R K G I V E Q C C T S I C S LY Q L E N Y C G, in order to improve the cleavage efficiency of the signal peptide and ensure the N-terminal Integrity, add the connection fragment K R E E A E A E A E PK at the N-terminus, introduce the Xho I EcoR I restriction site and connect it into the vector pPIC 9, and then clone it into the expression vector pPIC 9k with Sal I / Sac I, after conventional genetic engineering The genetically engineered bacteria expressing the insulin glargine precursor were obtained. After fermentation, the fermentation broth was taken for Tricine SDS-PAGE analysis. The results are shown i...

Embodiment 3

[0055] Embodiment 3: crude pure expression product

[0056] Escherichia coli expression product in Example 1, use 50mM PB+2mM EDTA, pH7.5 to break the bacteria; use 50mM Tris-HCl+2mM EDTA+0.5%Triton X-100, pH8.0; 50mMTris-HCl+2mM EDTA+1M Wash the bag sequentially with Urea, pH8.0; denature with 50mM Tris-HCl+2mM EDTA+8M Urea, pH9.0; sulfonate with 50mM Tris-HCl+2mM EDTA+8M Urea+0.3M Na2SO3, pH9.0; 2mM EDTA+1M Urea+1mM β-Me, pH 9.5 after renaturation, put on Q column, pH 8.0 salt concentration gradient elution to obtain crude precursor protein, SDS-PAGE analysis, the results are shown in the appendix Figure 4 , the results show that the precursor protein with higher purity can be obtained after renaturation crude purification, the molecular weight is about 17.8KD, and the main impurity is the dimer formed in the renaturation process.

[0057] In Example 2, the yeast expression product was diluted and the pH was adjusted to 4.0, and the CM column was eluted with a pH and salt ...

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Abstract

The invention discloses a preparation method of insulin glargine and an analogue thereof. The preparation method includes the following steps: (1) a gene engineering method is used for preparing a precursor of the insulin glargine and the analogue of the insulin glargine with a chain B and an end C containing a plurality of basic amino acids; (2) an amino acid side chain protective agent is used for distinguishing arginine or lysine through pancreatic enzyme specificity, and the insulin glargine and the analogue of the insulin glargine are provided with protecting groups and obtained under the effect of the protective agent and pancreatic enzyme; or the specificity is used for acting on clostripain of the arginine (Arg) or endoproteinase lysine (Lys) C of the Lys directly without protection; (3) carboxypeptidase is added optionally to remove unprotected basic amino acids at the tail end of the C; and (4) the glargine and the analogue of the insulin glargine are obtained through deprotection. The preparation method is simple and convenient, high in yield, wide in application range and suitable for introduction of more than two basic amino acids.

Description

technical field [0001] The present invention relates to a preparation method of insulin glargine and its analogues, in particular, the present invention relates to a method for preparing recombinant insulin glargine and its analogue precursors by genetic engineering, and converting the precursors into A method for insulin glargine and its analogs, the main structural feature of which is that the C-terminus contains multiple basic amino acids. Background technique [0002] Insulin glargine replaces asparagine (Asn) at position 21 on human insulin A chain with glycine (Gly); adds 2 arginines to threonine (Thr) at position 30 in B chain (Arg) and synthetic human insulin analogues. The addition of arginine increases the positive charge on the surface of the insulin molecule, and the isoelectric point rises from 5.4 to 6.7, making insulin glargine appear as a colorless and transparent solution in a weak acid environment, while its solubility is nearly neutral under physiological...

Claims

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Application Information

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IPC IPC(8): C12N15/70C12N15/81C12P21/06C07K14/62
CPCY02P20/55
Inventor 夏晶
Owner SHANGHAI HUAYI BIO LAB CO LTD
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