C1S

C1S, originating in the human liver, is a pivotal element of the plasma complement system. As a serine protease, C1S possesses enzymatic capabilities that are integral to the classical pathway of complement activation. The process begins with the binding of the antigen-antibody complex to C1q, which then triggers the activation of C1r and C1s, culminating in the formation of the C1qr2s2 complex. This initiation sets off a cascade of reactions that can lead to inflammation. C1S is essential in the immune system, contributing not only to the structure of the complement system but also to the modulation of immune responses and inflammation. Investigating C1S deepens our comprehension of the complement system's functions and its association with various diseases, laying a foundation for the development of preventative and therapeutic strategies.