1BL8 Membrane Protein date Jul 23, 1998
title Potassium Channel (Kcsa) From Streptomyces Lividans
authors D.A.Doyle, J.M.Cabral, R.A.Pfuetzner, A.Kuo, J.M.Gulbis, S.L.Cohe B.T.Chait, R.Mackinnon
compound source
Molecule: Protein (Potassium Channel Protein)
Chain: A, B, C, D
Engineered: Yes
Mutation: Yes
Organism_scientific: Streptomyces Lividans
Organism_taxid: 1916
Expression_system: Escherichia Coli
Expression_system_taxid: 562
Expression_system_strain: Xl-1 Blue
Expression_system_plasmid: Pqe60
Expression_system_gene: Kcsa
symmetry Space Group: C 1 2 1
R_factor 0.280 R_Free 0.290
length a length b length c angle alpha angle beta angle gamma
128.780 68.930 112.040 90.00 124.63 90.00
method X-Ray Diffractionresolution 3.20 Å
ligand K enzyme
note 1BL8 (Molecule of the Month:pdb38)
A, D, C, B

Primary referenceThe structure of the potassium channel: molecular basis of K+ conduction and selectivity., Doyle DA, Morais Cabral J, Pfuetzner RA, Kuo A, Gulbis JM, Cohen SL, Chait BT, MacKinnon R, Science 1998 Apr 3;280(5360):69-77. PMID:9525859
Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (58 Kb) [Save to disk]
  • Biological Unit Coordinates (1bl8.pdb1.gz) 53 Kb
  • LPC: Ligand-Protein Contacts for 1BL8
  • CSU: Contacts of Structural Units for 1BL8
  • Likely Quarternary Molecular Structure file(s) for 1BL8
  • Structure Factors (190 Kb)
  • Retrieve 1BL8 in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 1BL8 from S2C, [Save to disk]
  • Re-refined 1bl8 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 1BL8 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 1BL8
  • Cartoon representation from PDB Cartoon
  • Ramachandran plot from PDBSum
  • Structure-derived information
  • Electron Density related parameters from EDS Electron Density Server, at Upsala
  • Dipole moment, from Dipole Server at Weizmann Institute
  • Crystal Contacts, from CryCo at Weizmann Institute
  • 3D motif for 1BL8, from MSDmotif at EBI
  • Classification of representative domains in scop (Structural Classification of Proteins)
        - Domain d1bl8a_, region A [Jmol] [rasmolscript] [script source]
        - Domain d1bl8b_, region B [Jmol] [rasmolscript] [script source]
        - Domain d1bl8c_, region C [Jmol] [rasmolscript] [script source]
        - Domain d1bl8d_, region D [Jmol] [rasmolscript] [script source]
  • Fold representative 1bl8 from FSSP and Dali (Families of Structurally Similar Proteins)
  • Class (fold), Architecture (subfold), Topology, Homologous superfamily from CATH
  • Summaries and structural analyses of PDB data files from PDBSum
  • Identification of Protein Pockets & Cavities at CASTp
  • Sequence-derived information
  • View one-letter amino acid or nucleotide sequence for each chain: [1bl8_A] [1bl8] [1bl8_C] [1bl8_B] [1bl8_D]
  • SWISS-PROT database: [P0A334]
  • Belongs to the voltage-gated ion channel (vic) superfamily according to TCDB.
  • Domain organization of [KCSA_STRLI] by SWISSPFAM
  • Other resources with information on 1BL8
  • Community annotation for 1BL8 at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
  • Movements, Movies and Images
  • Images from IMB Jena Image Library of Biological Macromolecules.

  • You may enter another PDB ID code
    Go [Back], to the [PDB Lite page], to the [OCA Search page] or to the [PDB Home page]
    OCA© by Jaime Prilusky, 1996-2014
    Bioinformatics Unit
    Weizmann Institute of Science