Role of Ca2+ in the electrostatic stability and the functional activity of the globular domain of human C1q.
C1q is the recognition subunit of the classical pathway of the complement system and a major connecting link between classical pathway-driven innate immunity and IgG- or IgM-mediated acquired immunity. The basic structural subunit of C1q is composed of an N-terminal triple-helical collagen-like region and a C-terminal heterotrimeric globular head domain (gC1q) that is made up of individual A, B, and C chains. Recent crystallographic studies have revealed that the gC1q domain, which is the mai...Expand abstract
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