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==Cryo-EM structure of SARS-CoV2 KP.3.1.1 spike protein==
<StructureSection load='9uje' size='340' side='right'caption='[[9uje]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9uje]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Severe_acute_respiratory_syndrome_coronavirus_2 Severe acute respiratory syndrome coronavirus 2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9UJE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9UJE FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.1&#8491;</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=9uje FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9uje OCA], [https://pdbe.org/9uje PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9uje RCSB], [https://www.ebi.ac.uk/pdbsum/9uje PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9uje ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
KP.3.1.1 became a dominant successor to JN.1 by the second half of 2024 but the intrinsic pathogenicity and virological feature of KP.3.1.1 remain incompletely understood. Here, we comprehensively evaluated the pathogenesis and characteristics of KP.3.1.1 in comparison to JN.1 and other JN.1-derived variants including JN.1.7, KP.2, and KP.3. The unique S31del mutation on KP.3.1.1 spike confers further evasion to the clinically authorized mAb Pemivibart and reduces convalescent serum neutralization efficiency. Structural analysis indicates that S31del induces novel glycosylation sites that facilitates evasion of neutralizing antibodies. We further reveal that S31del significantly enhances pseudovirus entry efficiency in all evaluated cell types including the human primary nasal epithelial cells. Nevertheless, the intrinsic pathogenicity of KP.3.1.1 is similar to JN.1 and KP.3, and higher than that of JN.1.7 and KP.2 in a male hamster model. Interestingly, the increased virus infectivity conferred by S31del in KP.3.1.1 spike is counterbalanced by the NSP10 S33C mutation. Overall, our study indicates that a single spike mutation can confer both enhanced immune escape and increased viral infectivity. The opposing effects of spike and non-spike mutations highlight the complex interplay of viral genomic elements in shaping their overall fitness, and reveal the high plasticity of coronavirus evolution.

Pathogenicity, virological features, and immune evasion of SARS-CoV-2 JN.1-derived variants including JN.1.7, KP.2, KP.3, and KP.3.1.1.,Shi J, Zhao X, Jin X, Li J, Liu Y, Liu H, Hu YF, Chen Z, Xiao Y, Wang L, Wang Y, He Y, Chai Y, Hu B, Shuai H, Wang Y, Li X, Jiang S, Zhang Y, Zhang X, Chan WM, Chen LL, Cai JP, Sui B, Zhang H, Yang D, Zhu L, Yuan S, Zhou J, Huang JD, Yuen KY, To KK, Chan JF, Zhang BZ, Wang Q, He M, Sun L, Wang P, Chu H Nat Commun. 2025 Dec 11;16(1):11002. doi: 10.1038/s41467-025-66018-x. PMID:41381428<ref>PMID:41381428</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 9uje" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Severe acute respiratory syndrome coronavirus 2]]
[[Category: He MZ]]