CD BioGlyco's advanced Glycoengineering Platform closely follows the development trend in science and technology. We aim to provide customers with unparalleled support services for antibody digestion.

Advantages and Methods for Preparing Antibody Fragments

Antibodies are powerful tools for protein and molecular detection and purification. While intact antibodies (usually IgG or IgM) are suitable for most immunoassay applications, the performance of certain steps is enhanced by the use of antibody fragments such as Fab and F(ab')₂.

The discovery that the digestion of antibodies with certain proteolytic enzymes yields predictable fragments prompted earlier studies of antibody structures. For example, papain cleavage of the heavy chain CH2 domain above the disulfide bond linking the heavy chain produces three distinct fragments. These resulting fragments consist of the constant and variable regions of the heavy chains (V_H and C_H1) and light chains (V_L and C_L) linked by disulfide bonds. Each Fab binds one antigen. The remaining fragment, consisting of C_H2 and C_H3 heavy chain units, is easily crystallized and is called Fc (crystalline fraction). Subsequent studies showed that the Fc portion of antibodies was responsible for binding to receptors on immunocompetent cells. The IgG heavy chain is cleaved using pepsin at the site below the disulfide bond connecting the two heavy chains. The resulting fragment consists of two Fabs linked together by heavy chain disulfide bonds. The large molecular weight fragment is called F(ab')₂. Each F(ab')₂ can bind two antigens.

In fact, achieving antibody fragmentation is challenging and requires optimization of enzyme-mediated protein digestion. In addition, a sufficient amount of antibodies needs to be prepared to achieve the desired efficiency. Therefore, fragmentation is only performed when there is a specific need and sufficient antibody is available.

Fig.1 Structure of a typical full-size IgG antibody molecule showing its various domains. (Rodrigo, et al., 2015)

Key Technologies

Our core expertise lies in utilizing recombinant enzymes and engineered proteases that cleave at specific, well-defined sites within the antibody structure. This enables us to consistently generate high-purity Fab, F(ab')2, and Fc fragments without affecting the integrity of the glycan structures or the antigen-binding sites.

Precision Antibody Digestion for Glycoengineering

CD BioGlyco has developed a range of enzymes and related kits for antibody digestion. Our services include antibody dialysis, digestion with enzymes, and purification of proteolytic fragments. Digested antibodies generate homogeneous subunits that facilitate the development and analysis of biopharmaceuticals. In addition, we offer custom antibody fragmentation antibody development services.

Our digestion services of IgG below the hinge region focus on the Digestion of Mouse IgG2a and IgG3 below the Hinge Region. We have optimized protocols specifically for the unique structural characteristics of mouse IgG isotypes. Our methods ensure efficient and precise cleavage of mouse IgG2a and IgG3 antibodies, yielding high-quality fragments for mouse-specific research.

At CD BioGlyco, our digestion services for IgG below the hinge region are as follows:

• Project Design

We understand your specific research goals, antibody characteristics, and desired fragments. We then design a customized enzymatic digestion strategy, selecting the optimal enzyme, buffer, and reaction conditions to ensure precise cleavage.

• Enzymatic Digestion

Using our proprietary protocol, we perform controlled enzymatic digestion of your antibody, carefully monitoring the reaction progress to achieve the desired level of cleavage, minimize off-target proteolysis, and maximize the yield of the desired fragment.

• Fragment Purification

Advanced chromatographic techniques such as affinity and size exclusion chromatography are used to separate Fab, F(ab')2, and Fc fragments from digestion enzymes and residual uncleaved antibody.

• Characterization

Comprehensive characterization using techniques such as sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and mass spectrometry (MS) verifies fragment identity, purity, and integrity.

• Project Report

A detailed report is provided, including detailed experimental procedures, quality control data, and analytical results.

Workflow

Publication Data

Applications

• Isolating Fab and Fc fragments allows for detailed analysis of how glycan modifications influence effector function, leading to the design of safer and more effective antibodies.
• Enzymatic cleavage provides a site-specific method for conjugating payloads to antibody fragments, resulting in the creation of homogeneous antibodies with enhanced pharmacokinetics and efficacy.
• Fab fragments are widely used in cell-based assays, immunohistochemistry, and epitope mapping.

Advantages of Us

• Guaranteed quality: One-stop service for the antibody digestion
• Custom service: customized service to ensure your flexible choice in an efficient manner
• Comprehensive: A professional team specializes in glycoengineering
• Efficient: Detailed and reliable after-sales service

Frequently Asked Questions

CD BioGlyco aspires to become the trusted solution provider of your first choice. Our team of scientists has many years of experience in Antibody Glycoengineering. We provide customers with strong support for antibody digestion. For further details, please don't hesitate to contact us.

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