Fc region

Fc Region (Fragment Crystallizable Region)

Antibody Chains

Antibody Chains

Fc

The Fc region, short for Fragment Crystallizable region, is a critical component of an antibody's structure. It refers to the tail region of an antibody that interacts with cell surface receptors and other proteins of the immune system.

File:Antibody IgG1 surface.png

Diagram of an antibody showing the Fc region

Structure and Location

• The Fc region is located at the base of the Y-shaped antibody molecule.
• It is composed of constant regions of the heavy chains of the antibody.

Function and Role

• The Fc region is crucial for the antibody's effector functions, such as recruiting other components of the immune system to destroy pathogens.
• It binds to Fc receptors on the surface of immune cells, triggering immune responses like phagocytosis or antibody-dependent cellular cytotoxicity.

Types of Fc Regions

• Different classes of antibodies (IgG, IgM, IgA, IgE, and IgD) have distinct Fc regions, determining their specific roles and functions in the immune response.

Importance in Therapeutics

• The Fc region is the target for engineering therapeutic antibodies, as modifications to this region can alter the antibody's stability, half-life, and effector functions.
• It is also involved in antibody-dependent enhancement, a phenomenon where antibodies facilitate viral entry into host cells.

Biotechnological Applications

• In biotechnology, the Fc region is utilized to create fusion proteins for various therapeutic and diagnostic purposes.

See Also

• Antibody
• Immunology
• Biotechnology

External Links

• Nature: Antibodies
• Immunology at the National Center for Biotechnology Information

References

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Also see

• Antibody
• Fab region
• Protein tag

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