9UXE | pdb_00009uxe

SARS-CoV2 Spike protein with Fab fragment antibody KXD355,state2

PDB DOI: https://doi.org/10.2210/pdb9UXE/pdb
EM Map EMD-64582: EMDB EMDataResource

Classification: VIRAL PROTEIN/IMMUNE SYSTEM
Organism(s): Severe acute respiratory syndrome coronavirus 2, Homo sapiens
Expression System: Homo sapiens
Mutation(s): Yes

Deposited: 2025-05-13 Released: 2025-07-16
Deposition Author(s): Wang, H.
Funding Organization(s): National Natural Science Foundation of China (NSFC)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.17 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

This is version 1.0 of the entry. See complete history.

Literature

A rare B cell clonotype imprinted by ancestral SARS-CoV-2 develops cross-sarbecovirus neutralization in immune recalls.

Chen, X., Li, L., Du, R., Wang, Z., Li, Y., Sun, Y., Qin, R., Feng, H., Hu, L., Chen, X., Lu, M., Huang, X., Wang, H., Jiang, L., Zuo, T.

(2025) Cell Rep 44: 115964-115964

PubMed: 40616841 Search on PubMed
DOI: https://doi.org/10.1016/j.celrep.2025.115964
Primary Citation Related Structures:
9UXD, 9UXE

PubMed Abstract:
The ultimate potential of B cells imprinted by ancestral SARS-CoV-2 in developing neutralizing breadth and potency remains to be explored. Here, we longitudinally tracked B cells that recognize the wild-type spike in two individuals who were repeatedly infected by Omicron variants after receiving prototype mRNA vaccines. Functional and genetic analysis of 632 monoclonal antibodies (mAbs) from those B cells reveals that mAbs cloned after a second infection have dramatically enhanced neutralizing breadth and potency due to immune recalls. Among the eleven mAbs that broadly neutralize SARS-CoV-2 variants from the wild type to KP.3, five mAbs are classified into public clonotypes encoded by IGHV3-53 or IGHV3-66, whereas the rest belong to a rare clonotype encoded by IGHV3-74. Notably, IGHV3-74 mAbs can also potently neutralize other sarbecoviruses by targeting a non-dominant epitope partially overlapping with receptor-binding domain (RBD)-3 and RBD-5. These results support that ancestral SARS-CoV-2 immune imprinting can be harnessed in developing pan-SARS-CoV-2 and even cross-sarbecovirus vaccines.

Organizational Affiliation

Laboratory of Immunoengineering, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, China.

Macromolecule Content

Total Structure Weight: 578.99 kDa
Atom Count: 35,885
Modeled Residue Count: 4,501
Deposited Residue Count: 5,121
Unique protein chains: 3

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Spike glycoprotein	A, B, C	1,259	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 6 Gene Names: S, 2
UniProt
Find proteins for P0DTC2 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTC2 Go to UniProtKB: P0DTC2
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P0DTC2
Glycosylation
Glycosylation Sites: 14	Glycosylation Focus chain A Focus chain B Focus chain C	Go to GlyGen: P0DTC2-1
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Antibody KXD355, heavy chain	D, F [auth H], H [auth J]	237	Homo sapiens	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Antibody KXD355, light chain	E, G [auth L], I [auth K]	211	Homo sapiens	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
Sequence Annotations Expand
Reference Sequence

Oligosaccharides

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Entity ID: 4
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose	J [auth I], P, V	4		N-Glycosylation	Interactions Focus chain J [auth I] Focus chain P Focus chain V Interactions & Density Focus chain J [auth I] Focus chain P Focus chain V
Glycosylation Resources
GlyTouCan: G32152BH GlyCosmos: G32152BH GlyGen: G32152BH

Entity ID: 5
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	AA [auth a], K [auth F], L [auth G], M, N, AA [auth a], K [auth F], L [auth G], M, N, O, Q, R, S, T, U, W, X, Y, Z	2		N-Glycosylation	Interactions Focus chain AA [auth a] Focus chain K [auth F] Focus chain L [auth G] Focus chain M Focus chain N Focus chain O Focus chain Q Focus chain R Focus chain S Focus chain T Focus chain U Focus chain W Focus chain X Focus chain Y Focus chain Z Interactions & Density Focus chain AA [auth a] Focus chain K [auth F] Focus chain L [auth G] Focus chain M Focus chain N Focus chain O Focus chain Q Focus chain R Focus chain S Focus chain T Focus chain U Focus chain W Focus chain X Focus chain Y Focus chain Z
Glycosylation Resources
GlyTouCan: G42666HT GlyCosmos: G42666HT GlyGen: G42666HT

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NAG (Subject of Investigation/LOI) Query on NAG Download:Ideal Coordinates CCD File SDF format, chain ZA [auth C] SDF format, chain YA [auth C] SDF format, chain XA [auth C] SDF format, chain WA [auth C] SDF format, chain VA [auth C] SDF format, chain UA [auth C] SDF format, chain TA [auth B] SDF format, chain SA [auth B] SDF format, chain RA [auth B] SDF format, chain QA [auth B] SDF format, chain PA [auth B] SDF format, chain OA [auth B] SDF format, chain NA [auth B] SDF format, chain MA [auth B] SDF format, chain LA [auth B] SDF format, chain KA [auth B] SDF format, chain JA [auth A] SDF format, chain IA [auth A] SDF format, chain HA [auth A] SDF format, chain GA [auth A] SDF format, chain FA [auth A] SDF format, chain EA [auth A] SDF format, chain DA [auth A] SDF format, chain CA [auth A] SDF format, chain BB [auth C] SDF format, chain BA [auth A] SDF format, chain AB [auth C] MOL2 format, chain ZA [auth C] MOL2 format, chain YA [auth C] MOL2 format, chain XA [auth C] MOL2 format, chain WA [auth C] MOL2 format, chain VA [auth C] MOL2 format, chain UA [auth C] MOL2 format, chain TA [auth B] MOL2 format, chain SA [auth B] MOL2 format, chain RA [auth B] MOL2 format, chain QA [auth B] MOL2 format, chain PA [auth B] MOL2 format, chain OA [auth B] MOL2 format, chain NA [auth B] MOL2 format, chain MA [auth B] MOL2 format, chain LA [auth B] MOL2 format, chain KA [auth B] MOL2 format, chain JA [auth A] MOL2 format, chain IA [auth A] MOL2 format, chain HA [auth A] MOL2 format, chain GA [auth A] MOL2 format, chain FA [auth A] MOL2 format, chain EA [auth A] MOL2 format, chain DA [auth A] MOL2 format, chain CA [auth A] MOL2 format, chain BB [auth C] MOL2 format, chain BA [auth A] MOL2 format, chain AB [auth C] mmCIF format, chain ZA [auth C] mmCIF format, chain YA [auth C] mmCIF format, chain XA [auth C] mmCIF format, chain WA [auth C] mmCIF format, chain VA [auth C] mmCIF format, chain UA [auth C] mmCIF format, chain TA [auth B] mmCIF format, chain SA [auth B] mmCIF format, chain RA [auth B] mmCIF format, chain QA [auth B] mmCIF format, chain PA [auth B] mmCIF format, chain OA [auth B] mmCIF format, chain NA [auth B] mmCIF format, chain MA [auth B] mmCIF format, chain LA [auth B] mmCIF format, chain KA [auth B] mmCIF format, chain JA [auth A] mmCIF format, chain IA [auth A] mmCIF format, chain HA [auth A] mmCIF format, chain GA [auth A] mmCIF format, chain FA [auth A] mmCIF format, chain EA [auth A] mmCIF format, chain DA [auth A] mmCIF format, chain CA [auth A] mmCIF format, chain BB [auth C] mmCIF format, chain BA [auth A] mmCIF format, chain AB [auth C]	AB [auth C] BA [auth A] BB [auth C] CA [auth A] DA [auth A] AB [auth C], BA [auth A], BB [auth C], CA [auth A], DA [auth A], EA [auth A], FA [auth A], GA [auth A], HA [auth A], IA [auth A], JA [auth A], KA [auth B], LA [auth B], MA [auth B], NA [auth B], OA [auth B], PA [auth B], QA [auth B], RA [auth B], SA [auth B], TA [auth B], UA [auth C], VA [auth C], WA [auth C], XA [auth C], YA [auth C], ZA [auth C]	2-acetamido-2-deoxy-beta-D-glucopyranose C₈ H₁₅ N O₆ OVRNDRQMDRJTHS-FMDGEEDCSA-N		Interactions Focus chain AB [auth C] Focus chain BA [auth A] Focus chain BB [auth C] Focus chain CA [auth A] Focus chain DA [auth A] Focus chain EA [auth A] Focus chain FA [auth A] Focus chain GA [auth A] Focus chain HA [auth A] Focus chain IA [auth A] Focus chain JA [auth A] Focus chain KA [auth B] Focus chain LA [auth B] Focus chain MA [auth B] Focus chain NA [auth B] Focus chain OA [auth B] Focus chain PA [auth B] Focus chain QA [auth B] Focus chain RA [auth B] Focus chain SA [auth B] Focus chain TA [auth B] Focus chain UA [auth C] Focus chain VA [auth C] Focus chain WA [auth C] Focus chain XA [auth C] Focus chain YA [auth C] Focus chain ZA [auth C] Interactions & Density Focus chain AB [auth C] Focus chain BA [auth A] Focus chain BB [auth C] Focus chain CA [auth A] Focus chain DA [auth A] Focus chain EA [auth A] Focus chain FA [auth A] Focus chain GA [auth A] Focus chain HA [auth A] Focus chain IA [auth A] Focus chain JA [auth A] Focus chain KA [auth B] Focus chain LA [auth B] Focus chain MA [auth B] Focus chain NA [auth B] Focus chain OA [auth B] Focus chain PA [auth B] Focus chain QA [auth B] Focus chain RA [auth B] Focus chain SA [auth B] Focus chain TA [auth B] Focus chain UA [auth C] Focus chain VA [auth C] Focus chain WA [auth C] Focus chain XA [auth C] Focus chain YA [auth C] Focus chain ZA [auth C]