25GF | pdb_000025gf

Cryo-EM structure of the human KPTN-ITFG2-C12orf66-SZT2(2189-3432) complex

• PDB DOI: https://doi.org/10.2210/pdb25GF/pdb
• EM Map EMD-80082: EMDB EMDataResource

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2026-04-01 Released: 2026-08-26 
• Deposition Author(s): Yang, A., Liang, L.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.81 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Mechanistic insights into GATOR1 inhibition by GATOR2 and KICSTOR

Yang, A., Liang, L.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 285.99 kDa 
• Atom Count: 17,469 
• Modeled Residue Count: 2,204 
• Deposited Residue Count: 2,574 
• Unique protein chains: 4

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
KICSTOR complex protein kaptin	A	437	Homo sapiens	Mutation(s): 0  Gene Names: KPTN
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y664 (Homo sapiens) Explore Q9Y664  Go to UniProtKB:  Q9Y664
GTEx:  ENSG00000118162

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
KICSTOR subunit 2	B [auth D]	445	Homo sapiens	Mutation(s): 0  Gene Names: KICS2, C12orf66
UniProt & NIH Common Fund Data Resources
Find proteins for Q96MD2 (Homo sapiens) Explore Q96MD2  Go to UniProtKB:  Q96MD2
GTEx:  ENSG00000174206

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
KICSTOR complex protein ITFG2	C [auth B]	447	Homo sapiens	Mutation(s): 0  Gene Names: ITFG2
UniProt & NIH Common Fund Data Resources
Find proteins for Q969R8 (Homo sapiens) Explore Q969R8  Go to UniProtKB:  Q969R8
GTEx:  ENSG00000111203

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
KICSTOR complex protein SZT2	D [auth C]	1,245	Homo sapiens	Mutation(s): 0  Gene Names: SZT2, C1orf84, KIAA0467
UniProt & NIH Common Fund Data Resources
Find proteins for Q5T011 (Homo sapiens) Explore Q5T011  Go to UniProtKB:  Q5T011
GTEx:  ENSG00000198198

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.81 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): Yang, A., Liang, L.

---

Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	32571452

Revision History  

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