4TWK Transport Protein date Jun 30, 2014
title Crystal Structure Of Human Two Pore Domain Potassium Ion Cha (K2p2.1)
authors A.C.W.Pike, Y.Y.Dong, A.Tessitore, S.Goubin, C.Strain-Damerell, S.Mukhopadhyay, K.Kupinska, D.Wang, R.Chalk, G.Berridge, M.Grieb L.Shrestha, J.H.Ang, A.Mackenzie, A.Quigley, S.R.Bushell, C.A.Sh B.Faust, A.Chu, L.Dong, F.Von Delft, C.H.Arrowsmith, A.M.Edwards C.Bountra, N.A.Burgess-Brown, E.P.Carpenter
compound source
Molecule: Potassium Channel Subfamily K Member 2
Chain: A, B
Fragment: Unp Residues 26-300
Synonym: Outward Rectifying Potassium Channel Protein Trek- K(+) Channel Subunit,Two Pore Domain Potassium Channel Trek Pore Potassium Channel Tpkc1;
Engineered: Yes
Organism_scientific: Homo Sapiens
Organism_common: Human
Organism_taxid: 9606
Gene: Kcnk2, Trek, Trek1
Expression_system: Spodoptera Frugiperda
Expression_system_common: Fall Armyworm
Expression_system_taxid: 7108
Expression_system_vector_type: Baculovirus
Expression_system_plasmid: Pfb-Ct10hf-Lic
symmetry Space Group: P 21 21 21
R_factor 0.231 R_Free 0.258
length a length b length c angle alpha angle beta angle gamma
74.470 105.975 128.270 90.00 90.00 90.00
method X-Ray Diffractionresolution 2.60 Å
ligand 37X, K, MG, NAG enzyme
A, B

Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (171 Kb) [Save to disk]
  • Biological Unit Coordinates (4twk.pdb1.gz) 164 Kb
  • LPC: Ligand-Protein Contacts for 4TWK
  • CSU: Contacts of Structural Units for 4TWK
  • Structure Factors (687 Kb)
  • Retrieve 4TWK in mmCIF format [Save to disk]
  • Re-refined 4twk structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 4TWK in 3D
  • Proteopedia, because life has more than 2D.
  • On Jmol, a nice Rasmol like molecule viewer. This is good for easiest viewing of basic structure.
  • On FirstGlance, an excellent tool for a guided tour on the structure components, by E. Martz.
  • Visual 3D analysis of 4TWK
  • Cartoon representation from PDB Cartoon
  • Ramachandran plot from PDBSum
  • Structure-derived information
  • Dipole moment, from Dipole Server at Weizmann Institute
  • Crystal Contacts, from CryCo at Weizmann Institute
  • 3D motif for 4TWK, from MSDmotif at EBI
  • Fold representative 4twk from FSSP and Dali (Families of Structurally Similar Proteins)
  • Sequence-derived information
  • View one-letter amino acid or nucleotide sequence for each chain: [4twk] [4twk_A] [4twk_B]
  • SWISS-PROT database:
  • Domain organization of by SWISSPFAM
  • Other resources with information on 4TWK
  • Community annotation for 4TWK at PDBWiki (http://pdbwiki.org)

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