Medical Condition:
Complement 1q
Subcomponent of complement 1 (C1) which recognizes and binds to the heavy chain of IMMUNOGLOBULIN G or IMMUNOGLOBULIN M initiating the classical complement pathway. The interaction of C1q and immunoglobulin activates C1r and C1s. The activated C1r and C1s molecules are cleaved off the complex by C1-inhibitor, allowing the collagen-like region of C1q to become accessible for interaction with cell membrane C1q receptors.