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Target intelligence / Profile preview
Complement Component 3 Fragment d (C3d)
- Target
- C3d
- Molecular classification
- Complement protein fragment
01
Overview
Complement component 3 fragment d (C3d) is a proteolytic fragment derived from complement component 3 (C3). It plays a key role in enhancing B cell responses by acting as a molecular adjuvant when covalently attached to antigens, engaging complement receptor type 2 (CR2/CD21) on B cells. This interaction lowers the threshold for B cell activation during adaptive immune responses. It is an end-product of complement activation and can be a biomarker for complement system activity.
- Other names
- Complement fragment dComplement split product dComplement degradation product d
02
Mechanism of action
C3d enhances humoral immunity via co-stimulation of B cells by binding to CR2/CD21 when attached to antigens.
03
Biological functions
Immune responseOpsonizationB cell co-stimulationComplement activation regulation
04
Disease associations
InfectionAutoimmune diseasesInflammation
05
Safety considerations
Dysregulation of C3d production or clearance can contribute to immune-related diseases.
06
Biomarkers
C3d levels can be a biomarker for complement system activation in various diseases.
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