33CI | pdb_000033ci

Cryo-EM structure of MAGE-A4 (230-239)-bound HLA-A*02:01 in complex with Fab VR-58

• PDB DOI: https://doi.org/10.2210/pdb33CI/pdb
• EM Map EMD-59344: EMDB EMDataResource

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens, Mus musculus
• Expression System: Escherichia coli BL21(DE3), Cricetulus griseus
• Mutation(s): No 


• Deposited: 2026-08-09 Released: 2026-08-26 
• Deposition Author(s): Schuster, S., Weng, T.-H., Reinhart, C., Michel, H., Birkenfeld, J.
• Funding Organization(s): Max Planck Society

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental

Literature

Systematic De-Risking of TCR-Mimic Therapeutics Through Proteome-Wide Off-Target Landscaping and a Generalizable Design Rule Framework

Schuster, S., Hartl, F.A., Stehle, J., Beier, F., Al-Hasani, H., Reinhart, C., Weng, T.-H., Kraemer, S., Hamde, P., Herz, T., Oesterlin, S., Schmidt, M., Gross, T., Stehl, L., Kilb, N., Juenemann, G., Heiss, K., Sinclair, A., Schoettgen, J., Meyer, P., Atay, B., Zaghla, B.K.Q., Link, S., Goll, J., Leoni, B., Steinmann, B., Selinger, O., Welsch, S., Roth, G., Michel, H., Klatt, M., Birkenfeld, J.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 7-mer - A1B1C1D1E1F1G1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 7-mer - A4B1C1D1 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 146.79 kDa 
• Atom Count: 6,642 
• Modeled Residue Count: 843 
• Deposited Residue Count: 1,334 
• Unique protein chains: 7

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MHC class I antigen	A	296	Homo sapiens	Mutation(s): 0  Gene Names: HLA-A
UniProt
Find proteins for F6IQS1 (Homo sapiens) Explore F6IQS1  Go to UniProtKB:  F6IQS1

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-2-microglobulin	B	100	Homo sapiens	Mutation(s): 0  Gene Names: B2M, CDABP0092, HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens) Explore P61769  Go to UniProtKB:  P61769
GTEx:  ENSG00000166710

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Melanoma-associated antigen 4	C	10	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P43358 (Homo sapiens) Explore P43358  Go to UniProtKB:  P43358
GTEx:  ENSG00000147381

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Fab BBM.1 light chain	D [auth F]	214	Mus musculus	Mutation(s): 0

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Fab BBM.1 heavy chain	E [auth G]	222	Mus musculus	Mutation(s): 0

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
Fab VR-6 light chain	F [auth D]	215	Homo sapiens	Mutation(s): 0

Entity ID: 7
Molecule	Chains	Sequence Length	Organism	Details	Image
Fab VR-6 heavy chain	G [auth E]	277	Homo sapiens	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-08-26 
Deposition Author(s): Schuster, S., Weng, T.-H., Reinhart, C., Michel, H., Birkenfeld, J.

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Funding Organization	Location	Grant Number
Max Planck Society	Germany	--

Revision History  

• Version 1.0: 2026-08-26
  Type: Initial release