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Method of generating metal chelating affinity ligands

a metal chelating affinity and ligand technology, applied in the direction of solid sorbent liquid separation, filtration separation, water/sludge/sewage treatment, etc., can solve the problems of time-consuming and hence costly methods, undefined product rest products, and low efficiency of alkylation chemistry, etc., to achieve high yield, easy to obtain

Inactive Publication Date: 2006-02-09
GE HEALTHCARE BIO SCI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] Thus, one object of the present invention is an improved method of generating polydentate metal chelating affinity ligands for subsequent coupling to a base matrix, which method utilises cost-effective and easily available starting materials and reagents and provides high yields. This can be achieved as defined in claim 1.
[0016] Another object of the present invention is to enable a careful selection of the ligands that are immobilised onto a base matrix for use in IMAC. This can be achieved by a method of generating a separation medium comprising polydentate metal chelating affinity ligands coupled to a base matrix, wherein the coupling chemistry is well defined and easy to control.
[0019] Another object of the present invention is to provide ligands for immobilised metal affinity chromatography, which ligands presents an improved handle for coupling to a base matrix and hence an improved coupling efficiency as compared to prior art ligands.
[0020] An additional object of the present invention is to provide a chromatographic medium, which in use for immobilised metal affinity chromatography (IMAC) yields a low leakage of metal ions.

Problems solved by technology

Accordingly, the method of preparation involves separate steps for alkylating and deprotecting the amino acid, which steps renders the method time-consuming and hence costly.
In addition, the alkylation chemistry is less efficient, and after deprotection, the product is not well defined regarding rest products from neutralisation and cleavage.
However, this procedure may involve disadvantages, since the media obtained presents the immobilised desired chelating ligand as well as some unreacted carboxylic groups, thus yielding a heterogeneous media.
Furthermore, mono-N-protected amino acid compounds are expensive starting materials, rendering the overall method even more costly.
Solid phase synthesis in this way offers poor control of the reaction and potential side reactions, and thereby yields a less homogeneous product.
This synthetic method is elaborate and depends on a large excess of reagents to form the desired product that is eventually purified under specific chromatographic conditions, followed by reduction as an additional synthetic step, and is thereby less suited for use in large-scale production.

Method used

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  • Method of generating metal chelating affinity ligands
  • Method of generating metal chelating affinity ligands
  • Method of generating metal chelating affinity ligands

Examples

Experimental program
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Effect test

example 1

Carboxymethylation of Scaffold to Provide N,N-bis(ethyl-carboxymethyl Ester)+ / −Homocysteine Thiolactone

[0074] In a dry 250 mL round-bottomed flask, the D / L homocysteine thiolactone (4.5 g, 29.22 mmol) was dissolved in 100 mL DMF. To this was added bromo-acetic acid ethyl ester (9.76 g, 58.44 mmol, 6.48 mL), KI (4.850 g, 29.22 mmol) and NaHCO3 (14.727 g, 175 mmol). The reaction mixture was stirred at ambient temperature. The reaction was followed by TLC (toluene: ethyl acetate 3:1) and LC-MS data. The reaction was completed after 3.5 h.

[0075] The desired product has a Rf=0.35 (toluene: ethyl acetate 3:1). The solvent was evaporated, the resulting solid redissolved in CHCl3, extracted with H2O X 2. The organic phase was finally dried over Na2SO4, filtered and evaporated. The product was purified on flash column chromatography (toluene:ethyl acetate 3:1). [0076] Yield:7.636 g (26.422 mmol), 90%. [0077]1H-NMR: δ 1.52 (t, 6H, CH3-CH2—O—), δ 2.05-2.56 (m, 2H, —S—CH2-CH2—CH—C═O), δ 3.25...

example 2

Hydrolysis to Provide N,N-bis(carboxymethyl)+ / −homocysteine and Stability Test

[0078] N,N-bis(ethyl carboxymethyl ester)+ / −homocysteine thiolactone (50 mg, 0.173 mmol) prepared as described in example 1 above, was dissolved in 1 mL 1M NaOH. In a 100 mL round-bottomed flask. The reaction mixture was stirred at ambient temperature for 100 minutes. The reaction was followed to completion until no starting material was visible according to LC-MS.

[0079] Stability test: After complete hydrolysis, the above reaction mixture was diluted to 5 mL with H2O. The pH was adjusted to 12.5 and the reaction mixture was heated at 50° C. with stirring. A 50 μL sample was withdrawn from the mixture with 1 h intervals for four hours. Each 50 μL sample was then mixed with 1 mL MeOH for the LC-MS analysis. After this step, the reaction mixture was allowed to stand overnight and finally a 50 μL sample was withdrawn for the LC-MS analysis as described above. No decomposition was observed during the time o...

example 3

Coupling of the Product Obtained from Example 2 to Allylated Agarose Using AGE

[0082] 10 ml Sepharose™ HP-allyl (Amersham Biosciences, Uppsala, Sweden) (44 μmol / ml gel) was stirred in 20 ml distilled water with 1 g NaOAc. Br2 aq. saturated was added until that a persisting yellow colour is formed. Sodium formiate was then added until the yellow colour has disappeared. The gel was then washed with distilled water. N,N-bis(ethyl carboxymethyl ester)+ / −homocysteine thiolactone (102 mg) was stirred in 2 ml 1M NaOH at room temperature for 2 hours. 5 ml distilled water and 3 ml 1M NaHCO3 was added, and the pH was adjusted to 11.0 with 2M NaOH.

[0083] The ligand solution was then added to the drained gel in a vial, which was capped.

[0084] The vial was shaken at 50° C. for 16 h, then the gel was washed with distilled water on a glass filter funnel.

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Abstract

The present invention relates to a method of generating at least one polydentate metal chelating affinity ligand, which method comprises the steps of (a) providing at least one cyclic scaffold comprising a carbonyl, an adjacent sulphur and a nucleophile; (b) providing at least one polydentate metal chelating affinity ligand arm, optionally in a form wherein the metal chelating functionalities are protected, on each scaffold by derivatisation of the nucleophile of said scaffolds, while retaining the cyclic structure of the scaffold; (c) ring-opening at the bond between the carbonyl and the sulphur of the derivatised scaffold by adding a reagent that adds one or more metal chelating affinity ligand arms to the scaffold; and, if required, (d) deprotecting the functionalities of the ligand arm(s) provided in step (b). In the most preferred embodiment of the method, steps (c) and (d) are performed simultaneously as one single step.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of generating polydentate metal chelating affinity ligands. The invention also encompasses a method of generating a separation medium comprising such ligands, as well as such ligands and such a medium. BACKGROUND [0002] In any chemical or bioprocessing industry, the need to separate and purify a product from a complex mixture is a necessary and important step in the production line. Today, there exists a wide market of methods in which industry can accomplish these goals, one of which is chromatography. Chromatography is quite well suited to a variety of uses in the field of biotechnology, since it can separate complex mixtures with great precision and also is suitable for more delicate products, such as proteins, since the conditions under which it is performed are not typically severe. [0003] One chromatography method, which is an especially sensitive separation technique and also applicable to most types of proteins...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D15/08B01D15/38B01J20/281B01J45/00C07C323/58C07D333/36
CPCB01D15/3828B01J45/00C07C323/58B01J20/3265B01J20/286B01J20/3251C07D333/36C07D333/32
Inventor ANDERSSON, LARS C.TEDEBARK, ULFGEBRU, TESFAIAXEN, ANDREASMALOISEL, JEAN-LUC
Owner GE HEALTHCARE BIO SCI CORP
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