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| | <StructureSection load='5gyq' size='340' side='right'caption='[[5gyq]], [[Resolution|resolution]] 2.10Å' scene=''> | | <StructureSection load='5gyq' size='340' side='right'caption='[[5gyq]], [[Resolution|resolution]] 2.10Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5gyq]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Bchk9 Bchk9]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5GYQ OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5GYQ FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5gyq]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Rousettus_bat_coronavirus_HKU9 Rousettus bat coronavirus HKU9]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5GYQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5GYQ FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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]] 2.1Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">S, 2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=694006 BCHK9])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5gyq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5gyq OCA], [http://pdbe.org/5gyq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5gyq RCSB], [http://www.ebi.ac.uk/pdbsum/5gyq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5gyq 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=5gyq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5gyq OCA], [https://pdbe.org/5gyq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5gyq RCSB], [https://www.ebi.ac.uk/pdbsum/5gyq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5gyq ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SPIKE_BCHK9 SPIKE_BCHK9]] S1 region attaches the virion to the cell membrane by interacting with cell receptors, initiating the infection. S2 is a class I viral fusion protein. Under the current model, the protein has at least 3 conformational states: pre-fusion native state, pre-hairpin intermediate state, and post-fusion hairpin state. During viral and target cell membrane fusion, the coiled coil regions (heptad repeats) assume a trimer-of-hairpins structure, positioning the fusion peptide in close proximity to the C-terminal region of the ectodomain. The formation of this structure appears to drive apposition and subsequent fusion of viral and target cell membranes (By similarity). | + | [https://www.uniprot.org/uniprot/SPIKE_BCHK9 SPIKE_BCHK9] S1 region attaches the virion to the cell membrane by interacting with cell receptors, initiating the infection. S2 is a class I viral fusion protein. Under the current model, the protein has at least 3 conformational states: pre-fusion native state, pre-hairpin intermediate state, and post-fusion hairpin state. During viral and target cell membrane fusion, the coiled coil regions (heptad repeats) assume a trimer-of-hairpins structure, positioning the fusion peptide in close proximity to the C-terminal region of the ectodomain. The formation of this structure appears to drive apposition and subsequent fusion of viral and target cell membranes (By similarity). |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | ==See Also== | | ==See Also== |
| | *[[Sandbox 3001|Sandbox 3001]] | | *[[Sandbox 3001|Sandbox 3001]] |
| - | *[[Spike protein|Spike protein]] | + | *[[Spike protein 3D structures|Spike protein 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bchk9]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Gao, G F]] | + | [[Category: Rousettus bat coronavirus HKU9]] |
| - | [[Category: Huang, C]] | + | [[Category: Gao GF]] |
| - | [[Category: Qi, J]] | + | [[Category: Huang C]] |
| - | [[Category: Bat coronavirus hku9]] | + | [[Category: Qi J]] |
| - | [[Category: Sugar binding protein]]
| + | |
| - | [[Category: Viral protein]]
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| Structural highlights
Function
SPIKE_BCHK9 S1 region attaches the virion to the cell membrane by interacting with cell receptors, initiating the infection. S2 is a class I viral fusion protein. Under the current model, the protein has at least 3 conformational states: pre-fusion native state, pre-hairpin intermediate state, and post-fusion hairpin state. During viral and target cell membrane fusion, the coiled coil regions (heptad repeats) assume a trimer-of-hairpins structure, positioning the fusion peptide in close proximity to the C-terminal region of the ectodomain. The formation of this structure appears to drive apposition and subsequent fusion of viral and target cell membranes (By similarity).
Publication Abstract from PubMed
The suggested bat-origin for Middle East respiratory syndrome coronavirus (MERS-CoV) has revitalized the studies on other bat-derived coronaviruses for the interspecies transmission potential. Bat coronavirus (BatCoV) HKU9 is an important betacoronavirus (betaCoV) that is phylogenetically affiliated to the same genus as MERS-CoV. The bat-surveillance data indicated that BatCoV HKU9 has been widely spreading and circulating in bats. This highlights the necessity of characterizing the virus for its potential of crossing species barriers. The receptor binding domain (RBD) of the coronavirus spike (S) recognizes host receptors to mediate virus entry and is therefore a key factor determining the viral tropism and transmission capacity. In this study, the putative S RBD of BatCoV HKU9 (HKU9-RBD), which is homologous to other betaCoV RBDs that have been structurally and functionally defined, was characterized via a series of biophysical and crystallographic methods. By surface plasmon resonance, we demonstrated that HKU9-RBD binds to neither the SARS-CoV receptor of ACE2 nor the MERS-CoV receptor of CD26. We further solved the atomic structure of HKU9-RBD, which is expectedly composed of a core and an external subdomain. The core subdomain fold resembles those of other betaCoV RBDs; whereas the external subdomain is structurally unique with a single helix, explaining the inertness of HKU9-RBD to react with either ACE2 or CD26. Via comparison of thus-far available RBD structures, we further proposed a homologous inter-subdomain binding mode in betaCoV RBDs that anchors the core subdomain to the external subdomain. The revealed RBD features would shed light on the betaCoV evolution route.
Putative receptor-binding domain of bat-derived coronavirus HKU9 spike protein: evolution of betacoronavirus receptor binding motifs.,Huang C, Qi J, Lu GW, Wang Q, Yuan Y, Wu Y, Zhang Y, Yan J, Gao GF Biochemistry. 2016 Oct 3. PMID:27696819[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Huang C, Qi J, Lu GW, Wang Q, Yuan Y, Wu Y, Zhang Y, Yan J, Gao GF. Putative receptor-binding domain of bat-derived coronavirus HKU9 spike protein: evolution of betacoronavirus receptor binding motifs. Biochemistry. 2016 Oct 3. PMID:27696819 doi:http://dx.doi.org/10.1021/acs.biochem.6b00790
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