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- W1971066039 abstract "The binding abilities of human C-reactive protein (CRP) with the C-terminal fibrinogen-like (FBG) domain and the full-length form of human M-ficolin were investigated by pull-down and zonal affinity chromatography analyses. Pull-down assays using an N-acetyl-d-glucosamine (GlcNAc)-agarose column demonstrated that CRP binds to the trimeric FBG domains, and that the GlcNAc-binding ability of the FBG domain is unaffected by CRP binding. Interestingly, the full-length M-ficolin, comprising the N-terminal collagen-like (COL) and C-terminal FBG domains, displayed lower affinity for CRP, and the monomeric FBG domain showed virtually no binding to CRP, as qualitatively judged by zonal affinity chromatography using a GlcNAc column. These results indicated that CRP binding requires the trimeric form of the FBG domain, and that the presence of the COL domain reduces the interaction between CRP and M-ficolin. In addition, pull-down assays using a histidine-tag affinity column demonstrated that neither the full-length M-ficolin nor the trimeric FBG domains, immobilized through their C-terminal histidine tags, showed any affinity for CRP, indicating that the CRP binding site is located near Ala326 at the C-terminus of M-ficolin, spatially close to a neck region (around Pro115) between the FBG and COL domains. From these findings, we concluded that CRP binding is enhanced by conformational bending at the neck region of M-ficolin, to avoid steric hindrance by the COL domain. Such a situation may be generated by oligomeric M-ficolin binding to surfaces with widely distributed ligands, such as pathogens." @default.
- W1971066039 created "2016-06-24" @default.
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- W1971066039 date "2009-12-01" @default.
- W1971066039 modified "2023-10-12" @default.
- W1971066039 title "Binding site of C-reactive protein on M-ficolin" @default.
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- W1971066039 doi "https://doi.org/10.1016/j.molimm.2009.09.032" @default.
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