6acc

From Proteopedia

(Difference between revisions)

Revision as of 23:01, 10 April 2020

Trypsin-cleaved and low pH-treated SARS-CoV spike glycoprotein and ACE2 complex, ACE2-free conformation with three RBD in down conformation

6acc, resolution 3.60Å

Structural highlights

6acc is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

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.

Publication Abstract from PubMed

The trimeric SARS coronavirus (SARS-CoV) surface spike (S) glycoprotein consisting of three S1-S2 heterodimers binds the cellular receptor angiotensin-converting enzyme 2 (ACE2) and mediates fusion of the viral and cellular membranes through a pre- to postfusion conformation transition. Here, we report the structure of the SARS-CoV S glycoprotein in complex with its host cell receptor ACE2 revealed by cryo-electron microscopy (cryo-EM). The complex structure shows that only one receptor-binding domain of the trimeric S glycoprotein binds ACE2 and adopts a protruding "up" conformation. In addition, we studied the structures of the SARS-CoV S glycoprotein and its complexes with ACE2 in different in vitro conditions, which may mimic different conformational states of the S glycoprotein during virus entry. Disassociation of the S1-ACE2 complex from some of the prefusion spikes was observed and characterized. We also characterized the rosette-like structures of the clustered SARS-CoV S2 trimers in the postfusion state observed on electron micrographs. Structural comparisons suggested that the SARS-CoV S glycoprotein retains a prefusion architecture after trypsin cleavage into the S1 and S2 subunits and acidic pH treatment. However, binding to the receptor opens up the receptor-binding domain of S1, which could promote the release of the S1-ACE2 complex and S1 monomers from the prefusion spike and trigger the pre- to postfusion conformational transition.

Cryo-EM structure of the SARS coronavirus spike glycoprotein in complex with its host cell receptor ACE2.,Song W, Gui M, Wang X, Xiang Y PLoS Pathog. 2018 Aug 13;14(8):e1007236. doi: 10.1371/journal.ppat.1007236. PMID:30102747^[1]

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

References

↑ Song W, Gui M, Wang X, Xiang Y. Cryo-EM structure of the SARS coronavirus spike glycoprotein in complex with its host cell receptor ACE2. PLoS Pathog. 2018 Aug 13;14(8):e1007236. doi: 10.1371/journal.ppat.1007236. PMID:30102747 doi:http://dx.doi.org/10.1371/journal.ppat.1007236

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6acc"

@@ Line 3: / Line 3: @@
 <SX load='6acc' size='340' side='right' viewer='molstar' caption='[[6acc]], [[Resolution|resolution]] 3.60&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6acc]] is a 3 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ACC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6ACC FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6acc]] is a 3 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ACC OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6ACC FirstGlance]. <br>
-</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=6acc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6acc OCA], [http://pdbe.org/6acc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6acc RCSB], [http://www.ebi.ac.uk/pdbsum/6acc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6acc ProSAT]</span></td></tr>
+</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=6acc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6acc OCA], [http://pdbe.org/6acc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6acc RCSB], [http://www.ebi.ac.uk/pdbsum/6acc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6acc ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 17: / Line 17: @@
 </div>
 <div class="pdbe-citations 6acc" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Spike protein|Spike protein]]
 == References ==
 <references/>

6acc

From Proteopedia

Revision as of 23:01, 10 April 2020

Trypsin-cleaved and low pH-treated SARS-CoV spike glycoprotein and ACE2 complex, ACE2-free conformation with three RBD in down conformation

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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