43DZ | pdb_000043dz

The complex structure of RBD and KXD-I42

• PDB DOI: https://doi.org/10.2210/pdb43DZ/pdb
• EM Map EMD-81809: EMDB EMDataResource

• Classification: ANTIVIRAL PROTEIN
• Organism(s): Severe acute respiratory syndrome coronavirus 2, Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2026-06-27 Released: 2026-11-11 
• Deposition Author(s): Ge, J., Nie, C.
• Funding Organization(s): Other government

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.56 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

The complex structure of RBD and KXD-I42

Ge, J., Nie, C.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 3-mer - A2B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 46.84 kDa 
• Atom Count: 3,126 
• Modeled Residue Count: 407 
• Deposited Residue Count: 426 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Spike protein S1	A	196	Severe acute respiratory syndrome coronavirus 2	Mutation(s): 0  Gene Names: S, 2
UniProt
Find proteins for P0DTC2 (Severe acute respiratory syndrome coronavirus 2) Explore P0DTC2  Go to UniProtKB:  P0DTC2

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
The heavy chain of KXD-I42 fab	B	121	Homo sapiens	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
The light chain of KXD-I42 fab	C	109	Homo sapiens	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.56 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-11-11 
Deposition Author(s): Ge, J., Nie, C.

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Funding Organization	Location	Grant Number
Other government	China	--

Revision History  

• Version 1.0: 2026-11-11
  Type: Initial release