9SQ6 | pdb_00009sq6

Cryo-EM structure of the DDB1deltaB-CRBN-ALV2 complex bound to HELIOS

• PDB DOI: https://doi.org/10.2210/pdb9SQ6/pdb
• EM Map EMD-55108: EMDB EMDataResource

• Classification: LIGASE
• Organism(s): Homo sapiens
• Expression System: Trichoplusia ni
• Mutation(s): No 


• Deposited: 2025-09-19 Released: 2026-06-17 
• Deposition Author(s): Galli, P., Kater, L., Kempf, G., Cavadini, S., Thoma, N.H.
• Funding Organization(s): European Research Council (ERC), Swiss National Science Foundation, Other private

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.64 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of the DDB1deltaB-CRBN-ALV2 complex bound to HELIOS

Galli, P., Thoma, N.H.

To be published.

Biological Assembly 1  

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

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 164.37 kDa 
• Atom Count: 9,529 
• Modeled Residue Count: 1,210 
• Deposited Residue Count: 1,454 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA damage-binding protein 1	A	864	Homo sapiens	Mutation(s): 0  Gene Names: DDB1, XAP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q16531 (Homo sapiens) Explore Q16531  Go to UniProtKB:  Q16531
PHAROS:  Q16531 GTEx:  ENSG00000167986

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein cereblon	B	466	Homo sapiens	Mutation(s): 0  Gene Names: CRBN, AD-006
UniProt & NIH Common Fund Data Resources
Find proteins for Q96SW2 (Homo sapiens) Explore Q96SW2  Go to UniProtKB:  Q96SW2
PHAROS:  Q96SW2 GTEx:  ENSG00000113851

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Zinc finger protein Helios	C	124	Homo sapiens	Mutation(s): 0  Gene Names: IKZF2, HELIOS, ZNFN1A2
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UKS7 (Homo sapiens) Explore Q9UKS7  Go to UniProtKB:  Q9UKS7
PHAROS:  Q9UKS7 GTEx:  ENSG00000030419

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
A1JPR( Subject of Investigation/LOI)	E [auth B]	~{N}-[2-[3-[[1-[(3~{S})-2,6-bis(oxidanylidene)piperidin-3-yl]-2,5-bis(oxidanylidene)pyrrol-3-yl]amino]phenyl]propan-2-yl]-2-[(3-chloranyl-4-methyl-phenyl)amino]ethanamide C27 H28 Cl N5 O5 MSILORVPJOTZRH-NRFANRHFSA-N
ZN	D [auth B], F [auth C], G [auth C]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.64 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.21.2_5419
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-06-17 
Deposition Author(s): Galli, P., Kater, L., Kempf, G., Cavadini, S., Thoma, N.H.

---

Funding Organization	Location	Grant Number
European Research Council (ERC)	European Union	--
Swiss National Science Foundation	Switzerland	--
Other private		--
Other private		--

Revision History  

• Version 1.0: 2026-06-17
  Type: Initial release