2MGY

Solution structure of the mitochondrial translocator protein (TSPO) in complex with its high-affinity ligand PK11195

• PDB DOI: https://doi.org/10.2210/pdb2MGY/pdb
• BMRB: 19608

• Classification: MEMBRANE PROTEIN
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2013-11-11 Released: 2014-04-02 
• Deposition Author(s): Jaremko, M., Jaremko, L., Giller, K., Becker, S., Zweckstetter, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 105 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Structure of the mitochondrial translocator protein in complex with a diagnostic ligand.

Jaremko, L., Jaremko, M., Giller, K., Becker, S., Zweckstetter, M.

(2014) Science 343: 1363-1366

• PubMed: 24653034 
• DOI: https://doi.org/10.1126/science.1248725
• Primary Citation of Related Structures:  
  2MGY


• PubMed Abstract: 
  

  The 18-kilodalton translocator protein TSPO is found in mitochondrial membranes and mediates the import of cholesterol and porphyrins into mitochondria. In line with the role of TSPO in mitochondrial function, TSPO ligands are used for a variety of diagnostic and therapeutic applications in animals and humans. We present the three-dimensional high-resolution structure of mammalian TSPO reconstituted in detergent micelles in complex with its high-affinity ligand PK11195. The TSPO-PK11195 structure is described by a tight bundle of five transmembrane α helices that form a hydrophobic pocket accepting PK11195. Ligand-induced stabilization of the structure of TSPO suggests a molecular mechanism for the stimulation of cholesterol transport into mitochondria.

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Organizational Affiliation: 

Max-Planck-Institut für Biophysikalische Chemie, 37077 Göttingen, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 19.15 kDa 
• Atom Count: 1,361 
• Modelled Residue Count: 169 
• Deposited Residue Count: 169 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Translocator protein	A	169	Mus musculus	Mutation(s): 0  Gene Names: Tspo, Bzrp Membrane Entity: Yes
UniProt
Find proteins for P50637 (Mus musculus) Explore P50637  Go to UniProtKB:  P50637

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PKA	B [auth A]	N-[(2R)-butan-2-yl]-1-(2-chlorophenyl)-N-methylisoquinoline-3-carboxamide C21 H21 Cl N2 O RAVIZVQZGXBOQO-CQSZACIVSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
PKA	BindingDB:  2MGY	Ki: min: 0.31, max: 28.8 (nM) from 18 assay(s)
		Kd: min: 0.6, max: 2 (nM) from 2 assay(s)
		IC50: min: 1.3, max: 12 (nM) from 14 assay(s)

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 105 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-04-02 
Deposition Author(s): Jaremko, M., Jaremko, L., Giller, K., Becker, S., Zweckstetter, M.

Revision History  

• Version 1.0: 2014-04-02
  Type: Initial release
  
• Version 1.1: 2023-06-14
  Changes: Data collection, Database references, Derived calculations, Other
• Version 1.2: 2024-05-15
  Changes: Data collection, Database references