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Home › Learning centers › Protein research › Antibody purification and immunoprecipitation › Tech note: Rapid Protein G-based antibody purification

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Tech Note

Rapid and high-throughput purification of antibodies with Capturem Protein G

Capturem Protein G Miniprep, Capturem Protein G Maxiprep,
Capturem Protein G 96, and Capturem Protein G 24-Well Plate

  • Broad IgG affinity in a rapid purification workflow
  • Rapid isolation of concentrated antibodies in a low elution volume
  • 1–2 mg of purified antibody per column using Capturem Protein G Maxiprep
  • High well-to-well reproducibility for high-throughput applications using Capturem Protein G 96-well plates
Introduction Results Conclusions Methods

Introduction  

Protein G is a cell wall protein from group G streptococcal bacteria with a high affinity for the fragment crystallizable (Fc) region of monoclonal and polyclonal IgG-type antibodies from several different species, e.g., mouse, rat, human, etc. Capturem Protein G products use a recombinant Protein G engineered to remove the albumin binding domain as well as the cell wall and cell membrane-binding domains in order to improve specificity towards the Fc region of antibodies.

Capturem membranes have been engineered to have a very large surface area with low nonspecific background binding. The large surface area results in a high binding capacity (approximately 75 mg/ml of bed volume), about threefold higher than similar resins. In addition to providing a high binding capacity, the 3D structure of the membrane causes the loaded sample to flow through narrow pores with very short diffusion distances. This allows the membranes to rapidly bind to the target protein, yielding purified product in 5 minutes using Capturem miniprep columns and 15 minutes using Capturem maxiprep columns and high-throughput plate formats.

Results  

Comparison of Capturem Protein G and Capturem Protein A kits

The membranes in our Capturem Protein G minipreps, maxipreps, 24-well plates, and 96-well plates function in the same way as our Capturem Protein A membranes, except that they use Protein G to bind antibodies. Protein G has a slightly different affinity for antibodies than Protein A, and depending on the particular antibody and source species, Protein G might bind at a higher capacity than Protein A or vice versa. Typical binding capacities of Capturem Protein G Miniprep columns for serum from various source species are shown in Table I. For human IgGs, we expect that Protein G will be better for some isotypes. Even within a given isotype, there can be significant variability between IgG subclasses (Table II).

Typical binding capacities of Capturem Protein G Miniprep columns
Serum source Eluted antibody (µg)
Mouse 210
Rat 310
Rabbit 190
Human 430
Sheep 190
Goat 250

Table I. Typical binding capacities of Capturem Protein G Miniprep columns for different animal sera. Columns were loaded with 800 µl of serum from each animal diluted 1:3 with Protein G binding buffer. The samples were then washed and eluted as described in the Methods section below.

Relative binding affinities of Capturem Protein A and Protein G Miniprep columns
Human IgG subclass Capturem Protein A Capturem Protein G
IgG1 +++ ++++
IgG2 ++++ +++
IgG3 + ++++
IgG4 +++ ++++

Table II. Relative binding affinities of Capturem Protein A and Protein G Miniprep columns for human IgGs 1–4. Columns were loaded with 800 µl serum samples diluted 1:3 with Protein A or Protein G binding buffer then washed and eluted as described in the Methods section below. The relative affinities of the various IgG subtypes were determined by ELISA.

Binding capacity of Capturem Protein G Maxiprep columns

We used Capturem Protein G Maxiprep columns to purify mouse antibody produced from a hybridoma in a bioreactor (Figure 1). This test demonstrated the high binding capacity of the Protein G membrane when using optimized conditions. Typical antibody purifications yielded 1–2 mg per column (Table III).

Purification of a hybridoma bioreactor supernatant

Figure 1. Purification of a hybridoma bioreactor supernatant using Capturem Protein G Maxiprep columns. SDS-PAGE analysis was performed on fractions purified from two separate Capturem Protein G Maxiprep columns (Panels A & B) as described in the Methods section below. The gels show a typical degree of purity for eluted antibody fractions and demonstrate that most of the antibody is eluted in the first two fractions (2.37 mg from Column A and 2.07 mg from Column B, as seen in Table III). Lane M: Marker. Lane OS: Original sample. Lane FT1: Flowthrough 1. Lane FT2: Flowthrough 2. Lane W: Wash. Lane E1: Elution 1. Lane E2: Elution 2. Lane E3: Elution 3. Lane E4: Elution 4.


Antibody yield in Capturem Protein G Maxiprep eluates
E1 (mg) E2 (mg) Total (mg)
Column A 1.89 0.48 2.37
Column B 1.56 0.51 2.07

Table III. Antibody yield in eluate fractions from a hybridoma bioreactor supernatant purified using Capturem Protein G Maxiprep columns.

Comparison of Capturem Protein G 96-well plates with resin spin plates

We tested the binding capacity of a Capturem Protein G 96-well plate side-by-side with a commercially available 96-well Protein G resin spin plate to purify dilute amounts of antibody from hybridoma supernatants (Figure 2). Antibodies were eluted from the Capturem membrane in a smaller volume using a shorter workflow (15 minutes instead of 1 hour), yielding a more concentrated antibody in less time.

Protein G 96-Well Plate outperforms a resin plate

Figure 2. The Capturem Protein G 96-well plate outperforms a Protein G resin 96-well plate when used to purify a monoclonal antibody from dilute hybridoma supernatants. SDS-PAGE analysis was performed on fractions purified as described in the Methods section below from dilute hybridoma supernatants using either the Capturem Protein G 96‑well plate (top row) or a commercially available Protein G resin 96-well plate (bottom row). The Capturem plate had a significantly faster workflow (15 min instead of one hour), higher recovery, and a significantly more concentrated eluate due to the small volumes required. Lane M: Marker. Lane OS: Original sample. Lane FT: Flowthrough. Lane W: Wash. Lane W1: Wash 1. Lane W4: Wash 4. Lane EH: Highest-yield elution. Lane EL: Lowest-yield elution. Lane E1: Elution 1. Lane E2: Elution 2.

Capturem Protein G 96-well plates have low variability for high-throughput applications

In addition to high-throughput screening, Capturem Protein G 96-well plates can also be used for high-throughput affinity purification upstream of applications such as mass spectrometry-based antibody quantification. We loaded eight replicates of two different hybridoma clone supernatants and a serum sample into individual plate wells to demonstrate the reproducibility and capacity of the Capturem Protein G 96-well plate (Figure 3).

Reproducibility and capacity for HTP applications

Figure 3. Reproducibility and capacity of the Capturem Protein G 96-well plate for high-throughput applications. We loaded eight wells with each sample type and then measured the amount of antibody in the eluted fraction. The standard deviation measured here was 6.0%, 6.5%, and 4.9% for the Clone 4B12, Clone 8C1, and serum samples, respectively.

Conclusions  

Capturem Protein G products enable rapid IgG purification across a range of isotypes with a rapid workflow. Capturem Protein G 96-well plates offer consistent results for high-throughput applications, including affinity purification upstream of mass spectrometry-based antibody analysis, while Capturem Protein G Maxiprep columns can be used for projects requiring larger amounts of IgG. Capturem Protein G kits are appropriate for use with antibodies expressed in mammalian cells and whole serum, are compatible with various lysis buffers, and are available in miniprep, maxiprep, 24-well plate, and 96-well formats.

Methods  

Capturem Protein G Miniprep columns were used according to the Capturem Protein G Miniprep protocol. First, the columns were equilibrated with 300 µl of Pierce Protein G Binding Buffer and then centrifuged at 1,000g for 1 min. Serum samples from sheep, goat, rat, mouse, human, rabbit, and horse (250 µl each) were diluted in 1 ml of Protein G binding buffer, and 600 µl of sample was loaded on an equilibrated column, followed by centrifugation at 1,000g for 1 min. The loading process was then repeated with another 600 µl of sample. The columns were then washed with 800 µl of Protein G binding buffer at 1,000g for 1 min. The bound antibody was then eluted with 300 µl of elution buffer (0.1 M glycine, pH 2.5) into a tube containing 30 µl of neutralization buffer (1 M Tris, pH 8.5) to neutralize the eluted antibody.

Capturem Protein G Maxiprep columns were used according to the Capturem Protein G Maxiprep protocol. First, the columns were equilibrated by loading 6 ml of Pierce Protein G binding buffer and centrifuging at 2,000g for 3 min. Next, 6.3-ml samples of mouse hybridoma supernatant from a bioreactor were diluted to 25 ml in Protein G binding buffer and then loaded onto the equilibrated columns by centrifugation at 2,000g for 3 min. We collected samples of the flowthrough for SDS-PAGE (Lane FT1 in Figure 1), then centrifuged the 25-ml samples through the columns a second time and collected another set of samples for SDS-PAGE (Lane FT2 in Figure 1). The columns were then washed once with 20 ml of Protein G binding buffer at 2,000g for 3 min. Lastly, four consecutive elutions were performed, each with 1 ml of elution buffer. The eluted fractions were analyzed using SDS-PAGE and quantified by measuring the absorbance at 280 nm with a NanoDrop 2000 spectrophotometer.

For the comparison of the Capturem 96-well plate and the Protein G resin 96-well plate, hybridoma supernatants from each clone were loaded onto each plate following the protocol for each product. The plates were first equilibrated, and then the supernatants were loaded and washed according to the protocols. Finally, the monoclonal antibody clones were eluted with 600 µl of elution buffer plus 60 µl of neutralization buffer in a collection tube.

To test the reproducibility of our 96-well plates, we loaded eight identical samples of two different hybridoma supernatants and animal sera into individual wells. Again, we equilibrated, loaded, washed, and eluted according to the protocol using Pierce Protein G Binding Buffer for all binding and washing steps. Eluates from various samples were quantified by measuring the absorbance at 280 nm with a NanoDrop 2000 spectrophotometer.

Related Products

Cat. # Product Size License Quantity Details
635725 Capturem™ Protein G Miniprep Columns 10 Columns USD $215.00

License Statement

ID Number  
273 This product is covered by U.S. Patent Nos. 9,459,188 and/or 10,207,229, exclusively licensed to Takara Bio USA, Inc.

Capturem Protein G Miniprep Columns consist of single-use, disposable columns for simple, rapid purification of antibodies that yield 60 μg of purified antibody per column, depending upon the sample type, species, and antibody isotype. These miniprep columns are suitable for purification of antibodies from animal sera, ascites fluid, cell culture media, and other sources. Each column can hold up to 850 µl of sample and requires a minimum elution volume of 200 µl.

Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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Capturem Protein A- or G-functionalized membranes

Capturem Protein A- or G-functionalized membranes

Antibody purification workflow for Capturem Protein A or G 96-well plates. Each well can be loaded with up to 850 µl of a diluted sample (antibody sample diluted from 1:1 to 1:20 with buffer). Following binding, the membrane is then washed and the bound antibiody eluted with the appropriate buffers. Note: Protocol time varies for each format. Check user manuals for specifics on protocol times.

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Capturem spin columns and filtration devices

Capturem spin columns and filtration devices

Available Capturem spin column and filtration device formats. Pictured from left to right: nanoprep, miniprep, 96-well, 24-well, maxiprep, and large-volume Capturem formats. Formats available vary for the different functionalized membranes. Check product pages for list of available formats.

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Load volumes and approximate yields for available Capturem formats by chemistry

Load volumes and approximate yields for available Capturem formats by chemistry

Load volumes and yields of Capturem purification formats.

Back

635725: Capturem Protein G Miniprep Columns

635725: Capturem Protein G Miniprep Columns
635727 Capturem™ Protein G Maxiprep Columns 6 Columns USD $320.00

License Statement

ID Number  
273 This product is covered by U.S. Patent Nos. 9,459,188 and/or 10,207,229, exclusively licensed to Takara Bio USA, Inc.

Capturem Protein G Maxiprep Columns are single-use, disposable columns for simple, rapid purification of antibodies that yields up to 1.2 mg of purified antibody per column, depending upon antibody isotype and species. This maxiprep column is suitable for purification of antibodies from animal sera, ascites fluid, cell culture media, and other sources. Each column can hold up to 23 ml of sample and requires a minimum elution volume of 1 ml.

Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

Documents Components Image Data

Back

Capturem Protein A- or G-functionalized membranes

Capturem Protein A- or G-functionalized membranes

Antibody purification workflow for Capturem Protein A or G 96-well plates. Each well can be loaded with up to 850 µl of a diluted sample (antibody sample diluted from 1:1 to 1:20 with buffer). Following binding, the membrane is then washed and the bound antibiody eluted with the appropriate buffers. Note: Protocol time varies for each format. Check user manuals for specifics on protocol times.

Back

Capturem spin columns and filtration devices

Capturem spin columns and filtration devices

Available Capturem spin column and filtration device formats. Pictured from left to right: nanoprep, miniprep, 96-well, 24-well, maxiprep, and large-volume Capturem formats. Formats available vary for the different functionalized membranes. Check product pages for list of available formats.

Back

Load volumes and approximate yields for available Capturem formats by chemistry

Load volumes and approximate yields for available Capturem formats by chemistry

Load volumes and yields of Capturem purification formats.

Back

635727: Capturem Protein G Maxiprep Columns

635727: Capturem Protein G Maxiprep Columns
635726 Capturem™ Protein G 96-Well Plate 1 x 96-well plate USD $469.00

License Statement

ID Number  
273 This product is covered by U.S. Patent Nos. 9,459,188 and/or 10,207,229, exclusively licensed to Takara Bio USA, Inc.

Capturem Protein G 96-Well Plate is a single-use disposable 96-well plate for simple, rapid purification of antibodies that yields up to 60 μg of purified antibody per well, depending upon species and antibody isotype. Capturem Protein G 96-Well Plate is suitable for purification of antibodies from animal sera, ascites fluid, cell culture media, and other sources. Each well can hold up to 1 ml of sample and requires a minimum elution volume of 200 µl.

Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

Documents Components Image Data

Back

Capturem Protein A- or G-functionalized membranes

Capturem Protein A- or G-functionalized membranes

Antibody purification workflow for Capturem Protein A or G 96-well plates. Each well can be loaded with up to 850 µl of a diluted sample (antibody sample diluted from 1:1 to 1:20 with buffer). Following binding, the membrane is then washed and the bound antibiody eluted with the appropriate buffers. Note: Protocol time varies for each format. Check user manuals for specifics on protocol times.

Back

Capturem spin columns and filtration devices

Capturem spin columns and filtration devices

Available Capturem spin column and filtration device formats. Pictured from left to right: nanoprep, miniprep, 96-well, 24-well, maxiprep, and large-volume Capturem formats. Formats available vary for the different functionalized membranes. Check product pages for list of available formats.

Back

Load volumes and approximate yields for available Capturem formats by chemistry

Load volumes and approximate yields for available Capturem formats by chemistry

Load volumes and yields of Capturem purification formats.

Back

635726: Capturem Protein G 96-Well Plate

635726: Capturem Protein G 96-Well Plate

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