4dn8

Structure of porcine surfactant protein D neck and carbohydrate recognition domain complexed with mannose

spinqualitylabelsall models 4dn8, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4dn8 is a 1 chain structure with sequence from Pig. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BMA, CA Gene: SFTPD (PIG) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [SFTPD_PIG] Contributes to the lung's defense against inhaled microorganisms, organic antigens and toxins. Interacts with compounds such as bacterial lipopolysaccharides, oligosaccharides and fatty acids and modulates leukocyte action in immune response. May participate in the extracellular reorganization or turnover of pulmonary surfactant. Binds strongly maltose residues and to a lesser extent other alpha-glucosyl moieties (By similarity). Publication Abstract from PubMed Pigs can act as intermediate hosts by which reassorted influenza A virus (IAV) strains can be transmitted to humans and cause pandemic influenza outbreaks. The innate host defense component surfactant protein D (SP-D) interacts with glycans on the hemagglutinin of IAV and contributes to protection against IAV infection in mammals. This study shows that a recombinant trimeric neck lectin fragment derived from porcine SP-D (pSP-D) exhibits profound inhibitory activity against IAV, in contrast to comparable fragments derived from human SP-D. Crystallographic analysis of the pSP-D fragment complexed with a viral sugar component shows that a unique tripeptide loop alters the lectin site conformation of pSP-D. Molecular dynamics simulations highlight the role of this flexible loop, which adopts a more stable conformation upon sugar binding and may facilitate binding to viral glycans through contact with distal portions of the branched mannoside. The combined data demonstrate that porcine-specific structural features of SP-D contribute significantly to its distinct anti-IAV activity. These findings could help explain why pigs serve as important reservoirs for newly emerging pathogenic IAV strains. A Unique Sugar-binding Site Mediates the Distinct Anti-influenza Activity of Pig Surfactant Protein D.,van Eijk M, Rynkiewicz MJ, White MR, Hartshorn KL, Zou X, Schulten K, Luo D, Crouch EC, Cafarella TR, Head JF, Haagsman HP, Seaton BA J Biol Chem. 2012 Aug 3;287(32):26666-77. Epub 2012 Jun 8. PMID:22685299 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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