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Monoclonal IgM from hybridoma cell culture HiTrap IgM Purification HP The technique described here is optimized for purification of monoclonal IgM from hybridoma cell culture, but it can be used as a starting point to determine the binding and elution conditions required for other IgM preparations. Purification option Binding capacity Maximum Comments operating flow HiTrap IgM Purification HP Human IgM, 5 mg/column 4 ml/min Purification of monoclonal and human IgM. Prepacked 1 ml column. HiTrap IgM Purification HP columns are packed with a thiophilic adsorption medium (2-mercaptopyridine coupled to Sepharose High Performance). The interaction between the protein and the ligand has been suggested to result from the combined electron donatingand accepting-action of the ligand in a mixed mode hydrophilic-hydrophobic interaction. Purification example Figure 19 shows results from the purification of monoclonal a-Shigella IgM from hybridoma cell culture supernatant. SDS-PAGE analysis demonstrates a purity level of over 80%. Results from an ELISA (not shown) indicated a high activity of the antibody in the purified fraction. A 280 nm mS/cm 2.5 Sample: 75 ml of cell culture supernatent containing a-Shigella IgM, filtered through a 0.45 µm filter Column: HiTrap IgM Purification HP, 1 ml Binding buffer: 20 mM sodium phosphate buffer, 0.5 M potassium sulphate, pH 7.5 Elution buffer: 20 mM sodium phosphate buffer, pH 7.5 Cleaning buffer: 20 mM sodium phosphate buffer, pH 7.5, 30% isopropanol Flow: 1 ml/min 1.5 0.5 Flow through material Elution buffer IgM Cleaning buffer 100 80 60 40 20 0 0 80 100 0 ml Fig. 19a. Purification of a-Shigella IgM on HiTrap IgM Purification HP. Samples reduced with 2-mercaptoethanol M r 97 000 66 000 45 000 30 000 20 100 14 400 1 2 3 4 5 6 7 8 Non-reduced samples M r 97 000 66 000 45 000 30 000 20 100 14 400 1 2 3 4 5 6 7 8 Lane 1. Low Molecular Weight Calibration Kit Lane 2. Cell culture supernatant, starting material, diluted 20-fold Lane 3. IgM, human Lane 4. IgG Lane 5. Flow-through pool, diluted 20-fold Lane 6. Eluted IgM, fraction 8, diluted 8-fold Lane 7. Eluted IgM, fraction 9, diluted 8-fold Lane 8. Washing out unbound material, pool diluted 3-fold Fig. 19b. SDS-PAGE on PhastSystem, using PhastGel 4–15 with silver staining. 38
Performing a separation Column: Recommended flow rate: HiTrap IgM Purification HP 1 ml/min Binding buffer: 20 mM sodium phosphate, 0.8 M (NH 4 ) 2 SO 4 , pH 7.5 Elution buffer: 20 mM sodium phosphate, pH 7.5 Wash buffer: 20 mM sodium phosphate, pH 7.5 with 30% isopropanol The sample must have the same concentration of ammonium sulphate as the binding buffer. Slowly add small amounts of solid ammonium sulphate to the sample of hybridoma cell culture supernatant until the final concentration is 0.8 M. Stir slowly and continuously. Pass the sample through a 0.45 µm filter immediately before applying it to the column. To avoid precipitation of IgM, it is important to add the ammonium sulphate slowly. Purification 1. Wash column sequentially with at least 5 column volumes of binding, elution and wash buffer. 2. Equilibrate column with 5 column volumes of binding buffer. 3. Apply the sample. 4. Wash out unbound sample with 15 column volumes of binding buffer or until no material appears in the eluent (monitored at A 280 ). 5. Elute the IgM with 12 column volumes of elution buffer. 6. Wash the column with 7 column volumes of wash buffer. 7. Immediately re-equilibrate the column with 5 column volumes of binding buffer. Some monoclonal IgMs might not bind to the column at 0.8 M ammonium sulphate. Binding can be improved by increasing the ammonium sulphate concentration to 1.0 M. An increased concentration of ammonium sulphate will cause more IgG to bind, which might be a problem if serum has been added to the cell culture medium. If there is IgG contamination of the purified IgM, the IgG can be removed by using HiTrap Protein G HP, HiTrap Protein A HP or HiTrap rProtein A FF. Potassium sulphate (0.5 M) can be used instead of ammonium sulphate. Most monoclonal IgMs bind to the column in the presence of 0.5 M potassium sulphate and the purity of IgM is comparable to the purity achieved with 0.8 M ammonium sulphate. Some monoclonal IgMs may bind too tightly to the column for complete elution in binding buffer. The remaining IgM will be eluted with wash buffer, but the high content of isopropanol will cause precipitation of IgM. Perform an immediate buffer exchange (see page 134) or dilute the sample to preserve the IgM. Lower concentrations of isopropanol may elute the IgM and decrease the risk of precipitation. To increase capacity, connect several HiTrap IgM Purification HP columns in series. HiTrap columns can be used with a syringe, a peristaltic pump or connected to a liquid chromatography system, such as ÄKTAprime. Reuse of HiTrap lgM Purification HP depends on the nature of the sample and should only be performed with identical samples to prevent cross-contamination. 39
Page 1 and 2: Affinity Chromatography Principles
Page 3 and 4: Affinity Chromatography Principles
Page 5 and 6: Serine proteases and zymogens with
Page 7: Appendix 4 ........................
Page 10 and 11: This handbook describes the role of
Page 12 and 13: Affinity chromatography is also use
Page 14 and 15: BioProcess Media for large-scale pr
Page 17 and 18: Chapter 2 Affinity chromatography i
Page 19 and 20: Avoid using magnetic stirrers as th
Page 21 and 22: pH elution A change in pH alters th
Page 23 and 24: 0.6 0.4 0.2 0 A280 pH selected for
Page 25 and 26: Situation Cause Remedy Protein does
Page 27 and 28: Chapter 3 Purification of specific
Page 29 and 30: Table 2. Relative binding strengths
Page 31 and 32: Purification examples Figure 11 sho
Page 33 and 34: MAbTrap Kit Fig. 13. MAbTrap Kit, r
Page 35 and 36: Media characteristics Ligand Compos
Page 37 and 38: A 280 nm 2.0 1.5 1.0 0.5 Column: rP
Page 39: Desalt and/or transfer purified IgG
Page 43 and 44: M r 97 000 66 000 45 000 30 000 20
Page 45 and 46: in The Recombinant Protein Handbook
Page 47 and 48: Cleaning These procedures are appli
Page 49 and 50: Purification examples Figures 24 an
Page 51 and 52: Nickel solution: 0.1 M NiSO 4 Bindi
Page 53 and 54: Protein A fusion proteins IgG Sepha
Page 55 and 56: Purification or removal of serine p
Page 57 and 58: Sample: 2 ml clarified E. coli homo
Page 59 and 60: Serine proteases and zymogens with
Page 61 and 62: DNA binding proteins HiTrap Heparin
Page 63 and 64: Sample: Column: Binding buffer: Elu
Page 65 and 66: 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
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Several methods can be used to dete
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Media characteristics Composition M
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Performing a separation Binding buf
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Do not store the suspension for lon
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Sepharose has been modified and dev
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Ligand coupling Several methods are
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Couple a ligand through the least c
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Table 9 summarizes recommended liga
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Coupling through the primary amine
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Ligand and column preparation 1. Di
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Options Product Spacer Coupling con
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100 80 Coupled substance, % 60 40 2
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Coupling small ligands through amin
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Ligand coupling 1. Add the ligand s
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Alternative coupling solutions: Dis
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Media characteristics Product Compo
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Ligands containing amino groups can
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Chapter 6 Affinity chromatography a
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Resolution is achieved by the selec
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For any capture step, select the te
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Appendix 1 Sample preparation Sampl
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Remove salts from proteins with mol
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1. Filter (0.45 µm) or centrifuge
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For laboratory scale operations, Ta
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Removal of lipoproteins Lipoprotein
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Appendix 2 Selection of purificatio
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4. Estimate the amount of slurry (r
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Appendix 5 Conversion data: protein
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Middle unit residue (-H 2 0) Charge
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Expected results when changing cond
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Expected results with competitive e
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Appendix 8 Analytical assays during
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Appendix 9 Storage of biological sa
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Ordering information Product Quanti
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STREAMLINE, Sepharose, HiTrap, ÄKT
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