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Complement Component 3b (C3b)
- Target
- C3b
- Molecular classification
- Complement protein, Opsonin
01
Overview
Complement component 3b (C3b) is a central effector molecule in the complement system, a key part of innate immunity. It is generated by the proteolytic cleavage of complement component 3 (C3) and plays a critical role in opsonization, tagging pathogens and immune complexes for phagocytosis. C3b also participates in the formation of C3 and C5 convertases, amplifying the complement cascade. Its ability to covalently attach to microbial surfaces via its exposed thioester bond allows it to efficiently mark targets for immune clearance. Regulation of C3b activity is crucial to prevent damage to host tissues, and deficiencies in regulation can lead to autoimmune diseases.
- Other names
- C3 fragment b
02
Mechanism of action
N/A
03
Biological functions
OpsonizationComplement activationImmune responsePhagocytosis enhancement
04
Disease associations
Infection susceptibility (deficiency)Autoimmunity (dysregulation)Inflammation
05
Safety considerations
Off-target effects of complement inhibitionIncreased risk of infection with broad complement inhibitionPotential for thromboembolic events
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