9HJK | pdb_00009hjk

Cryo-EM structure of the Arabidopsis thaliana CAT4 transporter in the outward-open apo state

• PDB DOI: https://doi.org/10.2210/pdb9HJK/pdb
• EM Map EMD-52217: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Arabidopsis thaliana, saltans group
• Expression System: Saccharomyces cerevisiae, Escherichia coli
• Mutation(s): No 


• Deposited: 2024-11-29 Released: 2025-12-10 
• Deposition Author(s): Kolokouris, D., Kato, T., Newstead, S.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.27 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: in silico

Literature

Cryo-EM structure of the Arabidopsis thaliana CAT4 transporter in the outward-open state

Kolokouris, D., Newstead, S.

To be published.

Biological Assembly 1  

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

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 73.61 kDa 
• Atom Count: 4,818 
• Modeled Residue Count: 631 
• Deposited Residue Count: 680 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cationic amino acid transporter 4, vacuolar	A	562	Arabidopsis thaliana	Mutation(s): 0  Gene Names: CAT4, At3g03720, F20H23.25
UniProt
Find proteins for Q8W4K3 (Arabidopsis thaliana) Explore Q8W4K3  Go to UniProtKB:  Q8W4K3

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
SybB5	B	118	saltans group	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AV0 (Subject of Investigation/LOI)	D [auth B]	Lauryl Maltose Neopentyl Glycol C47 H88 O22 MADJBYLAYPCCOO-VWHTXWAPSA-N
CLR (Subject of Investigation/LOI)	C [auth A]	CHOLESTEROL C27 H46 O HVYWMOMLDIMFJA-DPAQBDIFSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.27 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.21_5207
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-12-10 
Deposition Author(s): Kolokouris, D., Kato, T., Newstead, S.

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Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	BB/M011224/1

Revision History  

• Version 1.0: 2025-12-10
  Type: Initial release