4TWK | pdb_00004twk

Crystal structure of human two pore domain potassium ion channel TREK1 (K2P2.1)

• PDB DOI: https://doi.org/10.2210/pdb4TWK/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMD


• Deposited: 2014-06-30 Released: 2014-08-06 
• Deposition Author(s): Pike, A.C.W., Dong, Y.Y., Tessitore, A., Goubin, S., Strain-Damerell, C., Mukhopadhyay, S., Kupinska, K., Wang, D., Chalk, R., Berridge, G., Grieben, M., Shrestha, L., Ang, J.H., Mackenzie, A., Quigley, A., Bushell, S.R., Shintre, C.A., Faust, B., Chu, A., Dong, L., von Delft, F., Arrowsmith, C.H., Edwards, A.M., Bountra, C., Burgess-Brown, N.A., Carpenter, E.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 
  0.258 (Depositor), 0.274 (DCC) 
• R-Value Work: 
  0.231 (Depositor), 0.247 (DCC) 
• R-Value Observed: 
  0.232 (Depositor) 

Starting Model: experimental

Literature

Crystal structure of human two pore domain potassium ion channel TREK1 (K2P2.1)

Pike, A.C.W., Dong, Y.Y., Tessitore, A., Goubin, S., Strain-Damerell, C., Mukhopadhyay, S., Kupinska, K., Wang, D., Chalk, R., Berridge, G., Grieben, M., Shrestha, L., Ang, J.H., Mackenzie, A., Quigley, A., Bushell, S.R., Shintre, C.A., Faust, B., Chu, A., Dong, L., von Delft, F., Arrowsmith, C.H., Edwards, A.M., Bountra, C., Burgess-Brown, N.A., Carpenter, E.P.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content 

• Total Structure Weight: 65.67 kDa 
• Atom Count: 3,941 
• Modeled Residue Count: 496 
• Deposited Residue Count: 566 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Potassium channel subfamily K member 2	A, B	283	Homo sapiens	Mutation(s): 0  Gene Names: KCNK2, TREK, TREK1 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for O95069 (Homo sapiens) Explore O95069  Go to UniProtKB:  O95069
PHAROS:  O95069 GTEx:  ENSG00000082482
Glycosylation
Glycosylation Sites: 1		Go to GlyGen: O95069-1

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
37X	E [auth A], F [auth A], G [auth A], H [auth A], L [auth B]	Octyl Glucose Neopentyl Glycol C27 H52 O12 TYXCLOLHZMMLEK-RNDJEAJNSA-N
NAG	K [auth B]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
K	C [auth A], D [auth A], J [auth B]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N
MG	I [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free:  0.258 (Depositor), 0.274 (DCC) 
• R-Value Work:  0.231 (Depositor), 0.247 (DCC) 
• R-Value Observed: 0.232 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.47	α = 90
b = 105.975	β = 90
c = 128.27	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-08-06 
Deposition Author(s): Pike, A.C.W., Dong, Y.Y., Tessitore, A., Goubin, S., Strain-Damerell, C., Mukhopadhyay, S., Kupinska, K., Wang, D., Chalk, R., Berridge, G., Grieben, M., Shrestha, L., Ang, J.H., Mackenzie, A., Quigley, A., Bushell, S.R., Shintre, C.A., Faust, B., Chu, A., Dong, L., von Delft, F., Arrowsmith, C.H., Edwards, A.M., Bountra, C., Burgess-Brown, N.A., Carpenter, E.P.

Revision History  

• Version 1.0: 2014-08-06
  Type: Initial release
  
• Version 1.1: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary
• Version 1.2: 2023-12-20
  Changes: Data collection, Database references, Refinement description, Structure summary
• Version 1.3: 2024-10-16
  Changes: Structure summary