1zvb

From Proteopedia

(Difference between revisions)

Revision as of 17:39, 24 December 2014

A structure-based mechanism of SARS virus membrane fusion

Structural highlights

1zvb is a 3 chain structure with sequence from Sars coronavirus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	1zv7, 1zv8, 1zva
Gene:	S (SARS coronavirus)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[SPIKE_CVHSA] S1 attaches the virion to the cell membrane by interacting with human ACE2 and CLEC4M/DC-SIGNR, initiating the infection. Binding to the receptor and internalization of the virus into the endosomes of the host cell probably induces conformational changes in the S glycoprotein. Proteolysis by cathepsin CTSL may unmask the fusion peptide of S2 and activate membranes fusion within endosomes. S2 is a class I viral fusion protein. Under the current model, the protein has at least three 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.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Entry of SARS coronavirus into its target cell requires large-scale structural transitions in the viral spike (S) glycoprotein in order to induce fusion of the virus and cell membranes. Here we describe the identification and crystal structures of four distinct alpha-helical domains derived from the highly conserved heptad-repeat (HR) regions of the S2 fusion subunit. The four domains are an antiparallel four-stranded coiled coil, a parallel trimeric coiled coil, a four-helix bundle, and a six-helix bundle that is likely the final fusogenic form of the protein. When considered together, the structural and thermodynamic features of the four domains suggest a possible mechanism whereby the HR regions, initially sequestered in the native S glycoprotein spike, are released and refold sequentially to promote membrane fusion. Our results provide a structural framework for understanding the control of membrane fusion and should guide efforts to intervene in the SARS coronavirus entry process.

Structures and polymorphic interactions of two heptad-repeat regions of the SARS virus S2 protein.,Deng Y, Liu J, Zheng Q, Yong W, Lu M Structure. 2006 May;14(5):889-99. PMID:16698550^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Deng Y, Liu J, Zheng Q, Yong W, Lu M. Structures and polymorphic interactions of two heptad-repeat regions of the SARS virus S2 protein. Structure. 2006 May;14(5):889-99. PMID:16698550 doi:http://dx.doi.org/10.1016/j.str.2006.03.007

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1zvb"

@@ Line 3: / Line 3: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1zvb]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Sars_coronavirus Sars coronavirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZVB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ZVB FirstGlance]. <br>
-</td></tr><tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1zv7|1zv7]], [[1zv8|1zv8]], [[1zva|1zva]]</td></tr>
+</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1zv7|1zv7]], [[1zv8|1zv8]], [[1zva|1zva]]</td></tr>
-<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">S ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=227859 SARS coronavirus])</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">S ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=227859 SARS coronavirus])</td></tr>
-<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1zvb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zvb OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1zvb RCSB], [http://www.ebi.ac.uk/pdbsum/1zvb PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1zvb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zvb OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1zvb RCSB], [http://www.ebi.ac.uk/pdbsum/1zvb PDBsum]</span></td></tr>
-<table>
+</table>
+== Function ==
+[[http://www.uniprot.org/uniprot/SPIKE_CVHSA SPIKE_CVHSA]] S1 attaches the virion to the cell membrane by interacting with human ACE2 and CLEC4M/DC-SIGNR, initiating the infection. Binding to the receptor and internalization of the virus into the endosomes of the host cell probably induces conformational changes in the S glycoprotein. Proteolysis by cathepsin CTSL may unmask the fusion peptide of S2 and activate membranes fusion within endosomes.  S2 is a class I viral fusion protein. Under the current model, the protein has at least three 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.
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 30: / Line 32: @@
 </StructureSection>
 [[Category: Sars coronavirus]]
-[[Category: Dai, J.]]
+[[Category: Dai, J]]
-[[Category: Deng, Y.]]
+[[Category: Deng, Y]]
-[[Category: Liu, J.]]
+[[Category: Liu, J]]
-[[Category: Lu, M.]]
+[[Category: Lu, M]]
-[[Category: Yong, W.]]
+[[Category: Yong, W]]
-[[Category: Zheng, Q.]]
+[[Category: Zheng, Q]]
 [[Category: Coiled coil]]
 [[Category: Conformational change]]
 [[Category: Membrane fusion]]
 [[Category: S2]]
-[[Category: Sars coronavirus]]
 [[Category: Viral protein]]
 [[Category: Virus entry]]

1zvb

From Proteopedia

Revision as of 17:39, 24 December 2014

A structure-based mechanism of SARS virus membrane fusion

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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