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- W2044465102 abstract "Complement factor H (fH) plays a pivotal role in regulating the alternative pathway, allowing complement activation to proceed on foreign surfaces, whilst protecting surrounding host cell surfaces from complement-mediated damage. Host cell recognition is mediated by polyanions such as sialic acid and glycosaminoglycans (GAGs), which promote a high affinity interaction between fH and C3b deposited on host cell surfaces. Factor H is composed of 20 short consensus repeats (SCRs); two heparin-binding sites have been identified within SCR 7 and SCR 20 and a third site is thought to exist within or near SCR 13. Using an extensive series of recombinant fH fragments and heparin affinity chromatography, we have localized the third heparin-binding domain to SCR 9. A recombinant fH fragment containing both SCR 7 and SCR 9 exhibited higher affinity for heparin than SCR 7 alone, suggesting that the individual heparin-binding sites interact simultaneously with heparin to create a higher avidity interaction. Recombinant fragments containing SCR 9 bound to endothelial cells, indicating that this domain is capable of interacting with polyanions within a physiologically relevant environment. In addition, the three heparin-binding sites exhibited differences in their specificity for certain GAGs, suggesting that the individual binding domains may possess separate GAG recognition functions." @default.
- W2044465102 created "2016-06-24" @default.
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- W2044465102 date "2006-04-01" @default.
- W2044465102 modified "2023-09-29" @default.
- W2044465102 title "Localization of the third heparin-binding site in the human complement regulator factor H1" @default.
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- W2044465102 doi "https://doi.org/10.1016/j.molimm.2005.09.012" @default.
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