|
|
| Line 3: |
Line 3: |
| <StructureSection load='3s6z' size='340' side='right'caption='[[3s6z]], [[Resolution|resolution]] 2.28Å' scene=''> | | <StructureSection load='3s6z' size='340' side='right'caption='[[3s6z]], [[Resolution|resolution]] 2.28Å' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[3s6z]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Mammalian_orthoreovirus_3_strain_dearing Mammalian orthoreovirus 3 strain dearing]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3S6Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3S6Z FirstGlance]. <br> | | <table><tr><td colspan='2'>[[3s6z]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Mammalian_orthoreovirus_3_Dearing Mammalian orthoreovirus 3 Dearing]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3S6Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3S6Z FirstGlance]. <br> |
| </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene></td></tr> | | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.28Å</td></tr> |
| <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=SIA:O-SIALIC+ACID'>SIA</scene></td></tr> | | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=SIA:O-SIALIC+ACID'>SIA</scene></td></tr> |
| <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2oj5|2oj5]], [[1kke|1kke]], [[3eoy|3eoy]], [[3s6x|3s6x]], [[3s6y|3s6y]]</div></td></tr>
| |
| <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">S1 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10886 Mammalian Orthoreovirus 3 strain Dearing])</td></tr>
| |
| <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3s6z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3s6z OCA], [https://pdbe.org/3s6z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3s6z RCSB], [https://www.ebi.ac.uk/pdbsum/3s6z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3s6z ProSAT]</span></td></tr> | | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3s6z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3s6z OCA], [https://pdbe.org/3s6z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3s6z RCSB], [https://www.ebi.ac.uk/pdbsum/3s6z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3s6z ProSAT]</span></td></tr> |
| </table> | | </table> |
| == Function == | | == Function == |
| [[https://www.uniprot.org/uniprot/SIGM1_REOVD SIGM1_REOVD]] Fiber-like molecule that attaches the virion to the host cell membrane by binding to the primary receptor F11R/JAM-A and to sialic acid containing proteins (coreceptor). The interaction of sigma-1 with F11R is required for NF-kB activation and apoptosis. Binding to both sialic acid and F11R is required to induce maximal levels of apoptosis.
| | [https://www.uniprot.org/uniprot/SIGM1_REOVD SIGM1_REOVD] Fiber-like molecule that attaches the virion to the host cell membrane by binding to the primary receptor F11R/JAM-A and to sialic acid containing proteins (coreceptor). The interaction of sigma-1 with F11R is required for NF-kB activation and apoptosis. Binding to both sialic acid and F11R is required to induce maximal levels of apoptosis. |
| <div style="background-color:#fffaf0;">
| |
| == Publication Abstract from PubMed ==
| |
| Many viruses attach to target cells by binding to cell-surface glycans. To gain a better understanding of strategies used by viruses to engage carbohydrate receptors, we determined the crystal structures of reovirus attachment protein sigma1 in complex with alpha-2,3-sialyllactose, alpha-2,6-sialyllactose, and alpha-2,8-di-siallylactose. All three oligosaccharides terminate in sialic acid, which serves as a receptor for the reovirus serotype studied here. The overall structure of sigma1 resembles an elongated, filamentous trimer. It contains a globular head featuring a compact beta-barrel, and a fibrous extension formed by seven repeating units of a triple beta-spiral that is interrupted near its midpoint by a short alpha-helical coiled coil. The carbohydrate-binding site is located between beta-spiral repeats two and three, distal from the head. In all three complexes, the terminal sialic acid forms almost all of the contacts with sigma1 in an identical manner, while the remaining components of the oligosaccharides make little or no contacts. We used this structural information to guide mutagenesis studies to identify residues in sigma1 that functionally engage sialic acid by assessing hemagglutination capacity and growth in murine erythroleukemia cells, which require sialic acid binding for productive infection. Our studies using sigma1 mutant viruses reveal that residues 198, 202, 203, 204, and 205 are required for functional binding to sialic acid by reovirus. These findings provide insight into mechanisms of reovirus attachment to cell-surface glycans and contribute to an understanding of carbohydrate binding by viruses. They also establish a filamentous, trimeric carbohydrate-binding module that could potentially be used to endow other trimeric proteins with carbohydrate-binding properties.
| |
| | |
| Crystal structure of reovirus attachment protein sigma1 in complex with sialylated oligosaccharides.,Reiter DM, Frierson JM, Halvorson EE, Kobayashi T, Dermody TS, Stehle T PLoS Pathog. 2011 Aug;7(8):e1002166. Epub 2011 Aug 4. PMID:21829363<ref>PMID:21829363</ref>
| |
| | |
| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| |
| </div>
| |
| <div class="pdbe-citations 3s6z" style="background-color:#fffaf0;"></div>
| |
|
| |
|
| ==See Also== | | ==See Also== |
| *[[Virus coat proteins 3D structures|Virus coat proteins 3D structures]] | | *[[Virus coat proteins 3D structures|Virus coat proteins 3D structures]] |
| == References ==
| |
| <references/>
| |
| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
| [[Category: Large Structures]] | | [[Category: Large Structures]] |
| [[Category: Mammalian orthoreovirus 3 strain dearing]] | | [[Category: Mammalian orthoreovirus 3 Dearing]] |
| [[Category: Dermody, T S]] | | [[Category: Dermody TS]] |
| [[Category: Reiter, D M]] | | [[Category: Reiter DM]] |
| [[Category: Stehle, T]] | | [[Category: Stehle T]] |
| [[Category: Beta-barrel]]
| |
| [[Category: Beta-spiral repeat]]
| |
| [[Category: Greek key motif]]
| |
| [[Category: Sialic acid receptor junctional adhesion molecule some]]
| |
| [[Category: Trimer]]
| |
| [[Category: Triple beta-spiral]]
| |
| [[Category: Viral attachment protein]]
| |
| [[Category: Viral capsid]]
| |
| [[Category: Viral protein]]
| |