Discuss alternate pathway of complement activation.

The alternate pathway of complement activation plays a crucial role in the innate immune response, providing a rapid defense mechanism against pathogens. Unlike the classical pathway, which requires the binding of antibodies to antigens, the alternate pathway is antibody-independent and is constantly activated at low levels in the circulation. This pathway amplifies the immune response and acts as a first line of defense, recognizing a broad range of pathogens, including bacteria, viruses, fungi, and parasites.

The alternate pathway is initiated by spontaneous hydrolysis of the complement component C3. In its inactive form, C3 is constantly circulating in the blood and lymph. Upon hydrolysis, C3 undergoes a conformational change, forming C3(H2O), which is capable of binding to factor B, another key protein in the complement system. The C3(H2O)-factor B complex binds to ___ _______ ___ _________ __________.
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