9ZFO | pdb_00009zfo

Cryo-EM Structure of Human STAT2-USP18-ISG15 Complex

PDB DOI: https://doi.org/10.2210/pdb9ZFO/pdb
EM Map EMD-74146: EMDB EMDataResource

Classification: SIGNALING PROTEIN
Organism(s): Homo sapiens
Expression System: Spodoptera frugiperda
Mutation(s): Yes

Deposited: 2025-12-01 Released: 2026-03-18
Deposition Author(s): Huynh, K.W., Yamaguchi, M.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.05 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

Validation slider image for 9ZFO

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

Literature

Insight into the scaffolding function of USP18 from a high resolution cryo-EM structure of STAT2-USP18-ISG15 ternary complex

Huynh, K.W., Plumb, R., Healy, D.R., Jove, V., Ralph, E.C., Lee, C.W., Wheeler, H., Levine, K., Huang, Z., Fennell, K., Corpina, R.A., Craig, T., Wes, P.D., Loria, P.M., Schenone, M., Han, S., Wang, F., Wu, H., Yamaguchi, M.

(2026) bioRxiv

DOI: https://doi.org/10.64898/2026.02.12.705587

Macromolecule Content

Total Structure Weight: 140.38 kDa
Atom Count: 6,635
Modeled Residue Count: 827
Deposited Residue Count: 1,217
Unique protein chains: 3

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ubl carboxyl-terminal hydrolase 18	A [auth U]	347	Homo sapiens	Mutation(s): 0 Gene Names: USP18, ISG43 EC: 3.4.19.12
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UMW8 (Homo sapiens) Explore Q9UMW8 Go to UniProtKB: Q9UMW8
PHAROS: Q9UMW8 GTEx: ENSG00000184979
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q9UMW8
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Signal transducer and activator of transcription 2	B [auth S]	713	Homo sapiens	Mutation(s): 0 Gene Names: STAT2
UniProt & NIH Common Fund Data Resources
Find proteins for P52630 (Homo sapiens) Explore P52630 Go to UniProtKB: P52630
PHAROS: P52630 GTEx: ENSG00000170581
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P52630
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Ubiquitin-like protein ISG15	C [auth I]	157	Homo sapiens	Mutation(s): 1 Gene Names: ISG15, G1P2, UCRP
UniProt & NIH Common Fund Data Resources
Find proteins for P05161 (Homo sapiens) Explore P05161 Go to UniProtKB: P05161
PHAROS: P05161 GTEx: ENSG00000187608
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P05161
Sequence Annotations Expand
Reference Sequence

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.05 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC	4.6.0
MODEL REFINEMENT	PHENIX	dev_5395

Structure Validation

View Full Validation Report

View more in-depth experimental data

Entry History

& Funding Information

Deposition Data

Released Date: 2026-03-18

Deposition Author(s):

Funding Organization	Location	Grant Number
Not funded		--

Revision History (Full details and data files)

Version 1.0: 2026-03-18
Type: Initial release

RCSB PDB is hosted by

RCSB PDB is a member of

RCSB Partners
Nucleic Acid Knowledgebase

CoreTrustSeal

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.