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JOURNAL ARTICLE
REVIEW
The lectin self of complement factor H.
Current Opinion in Structural Biology 2017 June
Complement, a part of the humoral innate immune system, is divided into three pathways. The classical and mannose-binding lectin pathways are triggered by specific recognition of foreign targets. Conversely, the alternative pathway (AP) is actively down-regulated on host tissue. Glycosaminoglycans (GAGs) and sialylated glycans mediate host recognition of the AP as self-associated molecular patterns (SAMPs) to the regulatory protein factor H (FH). This review summarizes the more recent years of research on SAMP recognition by FH from a structural biology point of view and discusses implications for two complement-associated conditions, age-related macular degeneration (AMD) and atypical hemolytic uremic syndrome (aHUS). Taking into account crystal structures that elucidated FH binding to a bacterial evasion protein and to the thioester domain of C3b, the target of FH-mediated AP restriction, a novel atomistic model for the mechanism by which FH prevents AP activation on self surfaces is proposed.
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