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Structure and specificity of complement receptors
Insights
Researchers identified 15-16 cell surface proteins that interact with the complement system. These complement receptors play key roles in regulating immune cell behavior and the complement system
Area of Science:
- Immunology and Molecular Biology
- Cellular and Molecular Immunology
Background:
- The complement system is a crucial part of innate immunity.
- Cell surface proteins mediating interactions with complement components are vital for immune regulation.
Purpose of the Study:
- To identify and characterize cell surface proteins that interact with soluble complement system components.
- To understand the roles of these complement receptors in immune responses.
Main Methods:
- Identification of cell surface proteins through biochemical and immunological assays.
- Characterization of interactions between identified proteins and complement factors (e.g., C3, C4, C1q, Factor H, C5a, C5b-9).
Main Results:
- Fifteen to 16 distinct cell surface proteins interacting with complement have been identified.
- Key identified receptors include CR1, CR2, CR3, CR4, DAF, and others binding C3/C4 fragments.
- Receptors for C1q, Factor H, C5a, and C5b-9 have also been characterized.
Conclusions:
- Complement receptors are widely distributed across tissues.
- These receptors are essential for controlling complement system activity.
- They play significant roles in regulating leukocyte behavior and growth.
Abstract:
Fifteen to 16 cell surface proteins which interact with soluble components of the complement system have now been identified. Most of these--CR1, CR2, CR3, "CR4", DAF, HSV-1 c glycoprotein, Gp 45-70, p150,95, cell-surface Factor H, and a 90 kD protein--interact with C3 or C4 and their degradation products. Other receptors for C1q, Factor H, C5a, and the C5b-9 complex have been identified. Receptors for additional complement proteins such as Factor B or its fragments are likely to exist. Complement receptors have a wide tissue distribution and have major roles in controlling the turnover of the complement system, and regulating behaviour and growth of leukocytes.