9BAW | pdb_00009baw

Cryo-EM structure of human importin beta-Ran-GTP heterodimer

• PDB DOI: https://doi.org/10.2210/pdb9BAW/pdb
• EM Map EMD-44412: EMDB EMDataResource

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-04-04 Released: 2025-10-08 
• Deposition Author(s): Ko, Y., Cingolani, G.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of human importin beta-Ran-GTP heterodimer

Ko, Y., Cingolani, G.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 117.41 kDa 
• Atom Count: 8,223 
• Modeled Residue Count: 1,046 
• Deposited Residue Count: 1,046 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Importin subunit beta-1	A	876	Homo sapiens	Mutation(s): 0  Gene Names: KPNB1, NTF97
UniProt & NIH Common Fund Data Resources
Find proteins for Q14974 (Homo sapiens) Explore Q14974  Go to UniProtKB:  Q14974
PHAROS:  Q14974 GTEx:  ENSG00000108424

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
GTP-binding nuclear protein Ran	B	170	Homo sapiens	Mutation(s): 0  Gene Names: RAN, ARA24, OK/SW-cl.81 EC: 3.6.5
UniProt & NIH Common Fund Data Resources
Find proteins for P62826 (Homo sapiens) Explore P62826  Go to UniProtKB:  P62826
PHAROS:  P62826 GTEx:  ENSG00000132341

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GTP	C [auth B]	GUANOSINE-5'-TRIPHOSPHATE C10 H16 N5 O14 P3 XKMLYUALXHKNFT-UUOKFMHZSA-N
MG	D [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-10-08 
Deposition Author(s): Ko, Y., Cingolani, G.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	--

Revision History  

• Version 1.0: 2025-10-08
  Type: Initial release