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- 저자 : Ramirez-Aportela, E. (검색결과 1 건)
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Silva-Martin, N.,Bartual, Sergio G.,Ramirez-Aportela, E.,Chacon, P.,Park, C.,Hermoso, Juan A. Current Biology 2014 Structure Vol.22 No.11
SIGN-R1 is a principal receptor for microbial polysaccharides uptake and is responsible for C3 fixation via an unusual complement activation pathway on splenic marginal zone macrophages. In these macrophages, SIGN-R1 is also involved in anti-inflammatory activity of intravenous immunoglobulin by direct interaction with sialylated Fcs. The high-resolution crystal structures of SIGN-R1 carbohydrate recognition domain and its complexes with dextran sulfate or sialic acid, and of the sialylated Fc antibody provide insights into SIGN-R1's selective recognition of α-2,6-sialylated glycoproteins. Unexpectedly, an additional binding site has been found in the SIGN-R1 carbohydrate recognition domain, structurally separate from the calcium-dependent carbohydrate-binding site. This secondary binding site could bind repetitive molecular patterns, as observed in microbial polysaccharides, in a calcium-independent manner. These two binding sites may allow SIGN-R1 to simultaneously bind both immune glycoproteins and microbial polysaccharide components, accommodating SIGN-R1's ability to relate the recognition of microbes to the activation of the classical complement pathway.
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