1K4C Membrane Protein date Oct 07, 2001
title Potassium Channel Kcsa-Fab Complex In High Concentration Of
authors Y.Zhou, J.H.Morais-Cabral, A.Kaufman, R.Mackinnon
compound source
Molecule: Antibody Fab Fragment Heavy Chain
Chain: A
Organism_scientific: Mus Musculus
Organism_common: House Mouse
Organism_taxid: 10090

Molecule: Antibody Fab Fragment Light Chain
Chain: B

Organism_scientific: Mus Musculus
Organism_common: House Mouse
Organism_taxid: 10090

Molecule: Potassium Channel Kcsa
Chain: C
Fragment: Potassium Channel Kcsa
Engineered: Yes
Mutation: Yes

Organism_scientific: Streptomyces Lividans
Organism_taxid: 1916
Expression_system: Escherichia Coli
Expression_system_taxid: 562
symmetry Space Group: I 4
R_factor 0.218 R_Free 0.233
length a length b length c angle alpha angle beta angle gamma
155.330 155.330 76.270 90.00 90.00 90.00
method X-Ray Diffractionresolution 2.00 Å
ligand DGA, F09, K enzyme
note 1K4C (Molecule of the Month:pdb38)
related structures by homologous chain: 1D6V, 1DQJ, 1R3J, 1S5H, 1YY8

Primary referenceChemistry of ion coordination and hydration revealed by a K+ channel-Fab complex at 2.0 A resolution., Zhou Y, Morais-Cabral JH, Kaufman A, MacKinnon R, Nature 2001 Nov 1;414(6859):43-8. PMID:11689936
Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (99 Kb) [Save to disk]
  • Biological Unit Coordinates (1k4c.pdb1.gz) 358 Kb
  • LPC: Ligand-Protein Contacts for 1K4C
  • CSU: Contacts of Structural Units for 1K4C
  • Likely Quarternary Molecular Structure file(s) for 1K4C
  • Structure Factors (533 Kb)
  • Retrieve 1K4C in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 1K4C from S2C, [Save to disk]
  • Re-refined 1k4c structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 1K4C 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 1K4C
  • 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
  • 3D motif for 1K4C, from MSDmotif at EBI
  • Classification of representative domains in scop (Structural Classification of Proteins)
        - Domain d1k4ca1, region A:1-118 [Jmol] [rasmolscript] [script source]
        - Domain d1k4ca2, region A:119-219 [Jmol] [rasmolscript] [script source]
        - Domain d1k4cb1, region B:1-107 [Jmol] [rasmolscript] [script source]
        - Domain d1k4cb2, region B:108-212 [Jmol] [rasmolscript] [script source]
        - Domain d1k4cc_, region C [Jmol] [rasmolscript] [script source]
  • 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: [1k4c] [1k4c_A] [1k4c_B] [1k4c_C]
  • SWISS-PROT database: [P01837] [P0A334]
  • Belongs to the voltage-gated ion channel (vic) superfamily according to TCDB.
  • Domain organization of [IGKC_MOUSE] [KCSA_STRLI] by SWISSPFAM
  • Domains found in 1K4C: [IG_like] [IGv ] by SMART
  • Other resources with information on 1K4C
  • Community annotation for 1K4C at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
  • Movements, Movies and Images
  • Images from IMB Jena Image Library of Biological Macromolecules.

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