9IY6 | pdb_00009iy6

BTN2A1-BTN3A1-BTN3A2 oligomer complex

• PDB DOI: https://doi.org/10.2210/pdb9IY6/pdb
• EM Map EMD-60986: EMDB EMDataResource

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2024-07-30 Released: 2026-02-18 
• Deposition Author(s): Xin, W., Huang, B., Su, Q., Zhou, Q.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 10.0 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structures of human BTN2A1-BTN3A1-BTN3A2 oligomer complex at 10 Angstroms resolution

Xin, W., Huang, B., Su, Q., Zhou, Q.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 8-mer - A4B4 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Homo 8-mer - A8 

Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - B2 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - B2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 437.29 kDa 
• Atom Count: 13,310 
• Modeled Residue Count: 1,728 
• Deposited Residue Count: 3,894 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Butyrophilin subfamily 2 member A1	A [auth E], B [auth F], E [auth I], F [auth J]	534	Homo sapiens	Mutation(s): 0  Gene Names: BTN2A1, BT2.1, BTF1
UniProt & NIH Common Fund Data Resources
Find proteins for Q7KYR7 (Homo sapiens) Explore Q7KYR7  Go to UniProtKB:  Q7KYR7
PHAROS:  Q7KYR7 GTEx:  ENSG00000112763

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Butyrophilin subfamily 3 member A2	C [auth G], G [auth K]	340	Homo sapiens	Mutation(s): 0  Gene Names: BTN3A2, BT3.2, BTF3, BTF4
UniProt & NIH Common Fund Data Resources
Find proteins for P78410 (Homo sapiens) Explore P78410  Go to UniProtKB:  P78410
PHAROS:  P78410 GTEx:  ENSG00000186470

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Butyrophilin subfamily 3 member A1	D [auth H], H [auth L]	539	Homo sapiens	Mutation(s): 0  Gene Names: BTN3A1, BTF5
UniProt & NIH Common Fund Data Resources
Find proteins for O00481 (Homo sapiens) Explore O00481  Go to UniProtKB:  O00481
PHAROS:  O00481 GTEx:  ENSG00000026950

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 10.0 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-02-18 
Deposition Author(s): Xin, W., Huang, B., Su, Q., Zhou, Q.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	32100975

Revision History  

• Version 1.0: 2026-02-18
  Type: Initial release