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Coupling through hydroxy, amino or thiol groups via a 12-carbon spacer arm Epoxy-activated Sepharose 6B Epoxy-activated Sepharose 6B is used for coupling ligands that contain hydroxyl, amino or thiol groups. Because of the long hydrophilic spacer arm, it is particularly useful for coupling small ligands such as choline, ethanolamine and sugars. The pre-activated matrix is formed by reacting Sepharose 6B with the bis oxirane, 1,4 bis-(2,3-epoxypropoxy-)butane. The partial structure is shown in Figure 66. S epharose O CH2 CH CH2 O (CH 2) 4 O CH2 CH CH2 OH O Fig. 66. Partial structure of Epoxy-activated Sepharose 6B. A stable ether linkage is formed between the hydrophilic spacer and the matrix. Free oxirane groups couple via stable ether bonds with hydroxyl-containing molecules such as sugars, via alkylamine linkages with ligands containing amino groups, and via thioether linkages with ligands containing thiol groups. Options Product Spacer Substitution Coupling conditions Maximum operating Comments arm per ml matrix flow Epoxy-activated 12-atom 19–40 µmoles pH 9–13, 16 hours - 75 cm/h* Supplied as a Sepharose 6B epoxy groups several days, freeze-dried +20 - +40 °C powder. *See Appendix 4 to convert linear flow (cm/h) to volumetric flow rate. Maximum operating flow is calculated from measurement in a packed column with a bed height of 10 cm and i.d. of 5 cm. Purification example A 280 nm Fucose-specific lectin Elution volume Fig. 67. Chromatography of a crude extract of Ulex europaeus on fucose coupled to Epoxy-activated Sepharose 6B, column volume 11 ml. Extract was applied in 0.9% NaCl. Fucose-specific lectin was eluted with 5 ml fucose (50 mg/ml). 116
Alternative coupling solutions: Distilled water or aqueous buffers with sugars and carbohydrates are preferable. Carbonate, borate or phosphate buffers can be used. Sodium hydroxide may be used for solutions of high pH. Organic solvents such as dimethylformamide (up to 50%) and dioxane (up to 50%) may be used to dissolve the ligand. The same concentration of organic solvent should be included in the coupling solution. Coupling procedure 1. Suspend the required amount of freeze-dried powder in distilled water (1 g freeze-dried powder gives about 3.0 ml final matrix volume). 2. Wash immediately for 1 hour on a sintered glass filter (porosity G3), using approximately 200 ml distilled water per gram freeze-dried powder, added in several aliquots. 3. Dissolve the ligand in the coupling buffer to a final concentration of 0.5–10 mg/ml (for protein ligands) or transfer solubilized ligands into the coupling buffer using a desalting column (see page 134). Adjust the pH of the aqueous phase. 4. Use a matrix:buffer ratio of 1:2, mix the matrix suspension with the ligand solution for 16 h at +25 to +40 °C in a shaking water bath. 5. Block remaining excess groups with 1 M ethanolamine for at least 4 h or overnight, at +40 to +50 °C. 6. Wash away excess ligand with coupling solution followed by distilled water, 0.1 M NaHCO 3 , 0.5 M NaCl, pH 8.0 and 0.1 M NaCl, 0.1 M acetate, pH 4.0. If organic solvents have been used, use pH paper to measure pH since solvents may damage pH electrodes. Using the higher temperatures can decrease coupling times. Do not use Tris, glycine or other nucleophilic compounds as these will couple to the oxirane groups. Do not use magnetic stirrers as they may disrupt the Sepharose matrix. 117
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Affinity Chromatography Principles
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Affinity Chromatography Principles
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Serine proteases and zymogens with
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Appendix 4 ........................
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This handbook describes the role of
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Affinity chromatography is also use
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BioProcess Media for large-scale pr
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Chapter 2 Affinity chromatography i
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Avoid using magnetic stirrers as th
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pH elution A change in pH alters th
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0.6 0.4 0.2 0 A280 pH selected for
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Situation Cause Remedy Protein does
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Chapter 3 Purification of specific
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Table 2. Relative binding strengths
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Purification examples Figure 11 sho
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MAbTrap Kit Fig. 13. MAbTrap Kit, r
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Media characteristics Ligand Compos
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A 280 nm 2.0 1.5 1.0 0.5 Column: rP
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Desalt and/or transfer purified IgG
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Performing a separation Column: Rec
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M r 97 000 66 000 45 000 30 000 20
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in The Recombinant Protein Handbook
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Cleaning These procedures are appli
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Purification examples Figures 24 an
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Nickel solution: 0.1 M NiSO 4 Bindi
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Protein A fusion proteins IgG Sepha
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Purification or removal of serine p
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Sample: 2 ml clarified E. coli homo
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Serine proteases and zymogens with
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DNA binding proteins HiTrap Heparin
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Sample: Column: Binding buffer: Elu
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Media characteristics Ligand densit
Page 67 and 68: Sample: Pooled and frozen human pla
Page 69 and 70: The harsh conditions required to br
Page 71 and 72: Purification or removal of albumin
Page 73 and 74: IFN-act. A units 280 nm 250 0.12 20
Page 75 and 76: Purification options Binding capaci
Page 77 and 78: Sepharose NH (CH 2) n NH N N O N N
Page 79 and 80: If detergent or denaturing agents h
Page 81 and 82: Glycoproteins or polysaccharides Co
Page 83 and 84: For complex samples containing glyc
Page 85 and 86: For complex samples containing glyc
Page 87 and 88: Chemical stability Avoid exposure t
Page 89 and 90: Proteins and peptides with exposed
Page 91 and 92: Several methods can be used to dete
Page 93 and 94: Media characteristics Composition M
Page 95 and 96: Performing a separation Binding buf
Page 97 and 98: Do not store the suspension for lon
Page 99 and 100: Sepharose has been modified and dev
Page 101 and 102: Ligand coupling Several methods are
Page 103 and 104: Couple a ligand through the least c
Page 105 and 106: Table 9 summarizes recommended liga
Page 107 and 108: Coupling through the primary amine
Page 109 and 110: Ligand and column preparation 1. Di
Page 111 and 112: Options Product Spacer Coupling con
Page 113 and 114: 100 80 Coupled substance, % 60 40 2
Page 115 and 116: Coupling small ligands through amin
Page 117: Ligand coupling 1. Add the ligand s
Page 121 and 122: Media characteristics Product Compo
Page 123 and 124: Ligands containing amino groups can
Page 125 and 126: Chapter 6 Affinity chromatography a
Page 127 and 128: Resolution is achieved by the selec
Page 129 and 130: For any capture step, select the te
Page 131 and 132: Appendix 1 Sample preparation Sampl
Page 133 and 134: Remove salts from proteins with mol
Page 135 and 136: 1. Filter (0.45 µm) or centrifuge
Page 137 and 138: For laboratory scale operations, Ta
Page 139 and 140: Removal of lipoproteins Lipoprotein
Page 141 and 142: Appendix 2 Selection of purificatio
Page 143 and 144: 4. Estimate the amount of slurry (r
Page 145 and 146: Appendix 5 Conversion data: protein
Page 147 and 148: Middle unit residue (-H 2 0) Charge
Page 149 and 150: Expected results when changing cond
Page 151 and 152: Expected results with competitive e
Page 153 and 154: Appendix 8 Analytical assays during
Page 155 and 156: Appendix 9 Storage of biological sa
Page 157 and 158: Ordering information Product Quanti
Page 159 and 160: STREAMLINE, Sepharose, HiTrap, ÄKT
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