Protein G Superflow 4

Protein G is an immunoglobulin-binding protein. Compared to protein A, protein G binds to a broader range of immunoglobulins and binds to all the subclasses of IgGs from humans, mice, and rats. Sterogene’s Protein G-Superflow 4 resin is highly stable, with a high binding capacity (35 mg of human IgG/ml), and increased flow rate. This media can be regenerated and used multiple times.

Below is the table, which can be used to select protein-A or protein G chromatography for the purification of specific classes of IgGs from different animal sources.

Product Code: 937611SF4
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Table 1. Resin Characteristics

Bead Material Agarose
Bead Percentage 4%
Bead Size60-160 µm
Flow Rate1>30 mL/min (>1020 cm/hr) @ 25oC
Binding Capacity 35 mg of IgG/ml of resin
Storage Temperature2-8o C
Storage Buffer 20% Ethanol
Form50% Slurry
Chemical Stability2Stable in all commonly used aqueous solutions and buffers.
Physical Stability2Negligible volume variation due to changes in pH or ionic strength.

1Linear flow rate = volumetric flow rate (cm3/h)/column cross-sectional area (cm2)

2Data refer to the coupled product, provided that the ligand can withstand the pH or chemical environment. Please note the following: pH stability, long term refers to the pH interval where the medium is stable over a long period of time without adverse effects on its subsequent chromatographic performance. pH stability, short term refers to the pH interval for regeneration and cleaning procedures.

Instructions for Use

Sterogene’s Protein G Superflow 4 is a high-quality affinity chromatographic resin used for one-step purification of various classes/subclasses of immunoglobulins at small to large from biological samples and over-expressed media. Our stable and simple to use Protein G Superflow 4 resin is made by covalently immobilizing purified recombinant Protein G to 4% highly crosslinked agarose beads through epoxy chemistry. The resin shows no leaching of Protein G in commonly used buffers and in a pH range from 2-13. Sterogene’s Protein G Superflow 4 has a high binding capacity of > 50 mg of IgG per ml of settled resin and can be used several times without significant loss in yield.
Protein G is a cell-wall protein expressed in certain Streptococcus bacteria belonging to Group G and C classes. Protein G from group G Streptococcus has 3 and group C Streptococcus has 2 IgG binding domains. In terms of binding, Protein G shows broader range and higher affinity for several IgGs than Protein A. It can be used for the purification of certain human monoclonal or polyclonal antibodies which are not recognized by Protein A. Protein G binds strongly to IgG through its Fc region and shows weak binding to the Fab region, but it fails to recognize human IgM, IgD and IgA. Protein G shows optimal binding with IgG at low pH (pH 5.0-5.5) but near physiological pH (~ pH 7.0) can be used for purification purposes.
Protein G Superflow 4 resin is designed for versatile usage. It can be used in small to large scale IgG purification using FPLC or gravity flow columns and can also be used efficiently for immunoprecipitation reactions.
Protein G Superflow 4 is supplied as 50% slurry in deionized water containing 0.02% sodium azide.
Upon receiving, store the resin at 2-8oC. Do not freeze.

Key features:
Matrix support: 4% crosslinked agarose beads
Immobilized ligand: recombinant Protein G (3IgG binding domains)
Ligand density: 5 mg Protein G/ml of agarose beads
Binding capacity: 50 mg of human IgG/ml of resin
Storage buffer: 0.02% sodium azide solution in deionized water
Elution buffer: 0.1 M glycine, pH 2-3.

Protocol for purification of IgG:
Materials required:
Sterogene Protein G Superflow 4 resin
Disposable columns
Equilibration buffer: 10 mM phosphate buffer with 150 mM NaCl (pH 7.0)
Wash buffer A: 10 mM phosphate with 150 mM NaCl (pH 7.5)
Wash buffer B: 10 mM phosphate buffer with 500 mM NaCl (pH 7.5)
Elution buffer: 0.1 M glycine, pH 3
Neutralization buffer: 1.0 M PBS or 1.0 M Tris (pH 8.0)
Remove the Protein G Superflow 4 resin from 4oC and equilibrate it at room temperature along with the required buffers. Below is the protocol for purification of IgG from serum using 1 ml of Protein G Superflow 4 in a column.
1. Pack 2 ml of Protein G Superflow 4 slurry in appropriate disposable column and let the column drain completely.
2. Wash the beads with 10 ml of equilibration buffer at high flow rate, let the column drain properly.
3. Dilute the loading sample (1:1) in equilibration buffer and apply to the column at slow flow rate. Check the loading sample for any precipitation after dilution. If required, centrifuge the sample (15000 rpm at room temperature for 15 min) to remove any precipitate and load the clear supernatant to the affinity column.
4. Wash the column with 10 ml of wash buffer A followed by 10 ml of wash buffer B. Monitor the wash fractions at OD280 for presence of any protein. Additional wash steps can be performed until the baseline is reached.
5. Elute the bound IgGs with 5 ml of 0.1 M glycine (pH 3.0), elution should be done at slow flow rate and in small fractions (500 µl).
6. Immediately neutralize the acidic pH of the eluted samples to physiological pH by adding 50 µl of neutralization buffer to each fraction and check their OD280 to calculate the IgG concentration.
7. Run all the fractions on SDS-PAGE to check the purity/homogeneity of the eluted protein, pool all the pure fractions and dialyze in the required buffer.
8. The Protein G Superflow 4 column can be regenerated by washing with 20 ml of wash buffer B and can be further used multiple times (>10 times) without loss of any significant activity.
9. For storage, wash the beads with 5 ml of deionized water containing 0.2% sodium azide and store the column at 4oC with 2-3 ml of same 0.02% sodium azide solution.

To Download Instructions for use:

INST 937611SF4 Protein G Superflow 4

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