5xku

From Proteopedia

(Difference between revisions)

Current revision

Crystal structure of hemagglutinin globular head from an H7N9 influenza virus in complex with a neutralizing antibody HNIgGA6

Structural highlights

5xku is a 3 chain structure with sequence from Homo sapiens and Influenza A virus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.78Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

R4NN21_9INFA Binds to sialic acid-containing receptors on the cell surface, bringing about the attachment of the virus particle to the cell. This attachment induces virion internalization of about two third of the virus particles through clathrin-dependent endocytosis and about one third through a clathrin- and caveolin-independent pathway. Plays a major role in the determination of host range restriction and virulence. Class I viral fusion protein. Responsible for penetration of the virus into the cell cytoplasm by mediating the fusion of the membrane of the endocytosed virus particle with the endosomal membrane. Low pH in endosomes induces an irreversible conformational change in HA2, releasing the fusion hydrophobic peptide. Several trimers are required to form a competent fusion pore (By similarity).[RuleBase:RU003324][SAAS:SAAS008980_004_327643]

Publication Abstract from PubMed

Since its first emergence in East China in early 2013, many cases of avian influenza A H7N9 have been reported. The disease has extended to 22 provinces in mainland China and some surrounding areas. Strategies to combat viral infection are urgently needed. We previously isolated a human monoclonal antibody, HNIgGA6, that neutralized H7N9 virus both in vitro and in vivo. In this study, we determined the crystal structure of viral hemagglutinin (HA) globular head bound to the Fab fragment of HNIgGA6. The crystal structure shows that the tip of the HNIgGA6 heavy-chain complementarity determining region 3 (HCDR3) directly interposes into the receptor binding site (RBS) and mimics, in many respects, the interaction of the sialic acid receptor. Three residues atY98, H183 and E190, that are critical to human cellular receptor binding, are also essential for HNIgGA6 recognition. At meanwhile, dual mutations at V186G and L226Q in RBS were able to disrupt viral HA1 binding with the antibody. Our study provides a better understanding of the mechanism for protective antibody recognition and sound foundation for the design of therapeutic drugs and vaccines against H7N9 influenza.ImportanceNeutralization by antibody is one of the most important mechanisms for a host to defend against viral infections. Human-originated antibody HNIgGA6 was generated in response to the natural infectious H7N9 virus and had potential use for suppression of H7N9 infection, with possible therapeutic implications. The crystal structure of HNIgGA6/HA1 complex provided new insight into the protective immune response to H7N9 virus in humans, as well as opinion for the development of effective H7N9 pandemic vaccines and antiviral molecules.

Structural insight into a human neutralizing antibody against influenza virus H7N9.,Chen C, Liu L, Xiao Y, Cui S, Wang J, Jin Q J Virol. 2017 Dec 6. pii: JVI.01850-17. doi: 10.1128/JVI.01850-17. PMID:29212936^[1]

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

References

↑ Chen C, Liu L, Xiao Y, Cui S, Wang J, Jin Q. Structural insight into a human neutralizing antibody against influenza virus H7N9. J Virol. 2017 Dec 6. pii: JVI.01850-17. doi: 10.1128/JVI.01850-17. PMID:29212936 doi:http://dx.doi.org/10.1128/JVI.01850-17

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/5xku"

@@ Line 3: / Line 3: @@
 <StructureSection load='5xku' size='340' side='right'caption='[[5xku]], [[Resolution|resolution]] 1.78&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[5xku]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/9infa 9infa] and [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5XKU OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5XKU FirstGlance]. <br>
+<table><tr><td colspan='2'>[[5xku]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Influenza_A_virus Influenza A virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5XKU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5XKU 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]] 1.78&#8491;</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=5xku FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5xku OCA], [http://pdbe.org/5xku PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5xku RCSB], [http://www.ebi.ac.uk/pdbsum/5xku PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5xku ProSAT]</span></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'>[https://proteopedia.org/fgij/fg.htm?mol=5xku FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5xku OCA], [https://pdbe.org/5xku PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5xku RCSB], [https://www.ebi.ac.uk/pdbsum/5xku PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5xku ProSAT]</span></td></tr>
 </table>
+== Function ==
+[https://www.uniprot.org/uniprot/R4NN21_9INFA R4NN21_9INFA] Binds to sialic acid-containing receptors on the cell surface, bringing about the attachment of the virus particle to the cell. This attachment induces virion internalization of about two third of the virus particles through clathrin-dependent endocytosis and about one third through a clathrin- and caveolin-independent pathway. Plays a major role in the determination of host range restriction and virulence. Class I viral fusion protein. Responsible for penetration of the virus into the cell cytoplasm by mediating the fusion of the membrane of the endocytosed virus particle with the endosomal membrane. Low pH in endosomes induces an irreversible conformational change in HA2, releasing the fusion hydrophobic peptide. Several trimers are required to form a competent fusion pore (By similarity).[RuleBase:RU003324][SAAS:SAAS008980_004_327643]
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 23: / Line 26: @@
 __TOC__
 </StructureSection>
-[[Category: Human]]
+[[Category: Homo sapiens]]
+[[Category: Influenza A virus]]
 [[Category: Large Structures]]
-[[Category: Chen, C]]
+[[Category: Chen C]]
-[[Category: Cui, S]]
+[[Category: Cui S]]
-[[Category: Gao, X]]
+[[Category: Gao X]]
-[[Category: Jin, Q]]
+[[Category: Jin Q]]
-[[Category: Wang, J]]
+[[Category: Wang J]]
-[[Category: Wang, W]]
+[[Category: Wang W]]
-[[Category: Antibody]]
-[[Category: Complex]]
-[[Category: Hemagglutinin]]
-[[Category: Immune system]]
-[[Category: Influenza some]]

5xku

From Proteopedia

Current revision

Crystal structure of hemagglutinin globular head from an H7N9 influenza virus in complex with a neutralizing antibody HNIgGA6

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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