1K4D	Membrane Protein	date	Oct 07, 2001
title	Potassium Channel Kcsa-Fab Complex In Low Concentration Of K
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 0.235
crystal cell	length a length b length c angle alpha angle beta angle gamma 155.290 155.290 75.740 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	2.30 Å
ligand	DGA, F09, K, NA	enzyme
related structures	by homologous chain: 1C08, 1EJO, 1M7D, 1R3I, 1S5H, 1XF3
Gene Ontology	Chain Function Process Component B C
Primary reference	Chemistry 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] (93 Kb) [Save to disk] Biological Unit Coordinates (1k4d.pdb1.gz) 339 Kb LPC: Ligand-Protein Contacts for 1K4D CSU: Contacts of Structural Units for 1K4D Likely Quarternary Molecular Structure file(s) for 1K4D Structure Factors (337 Kb) Retrieve 1K4D in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1K4D from S2C, [Save to disk] Re-refined 1k4d structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1K4D 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 1K4D

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 1K4D, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1k4da1, region A:1-118 [Jmol] [rasmolscript] [script source]     - Domain d1k4da2, region A:119-219 [Jmol] [rasmolscript] [script source]     - Domain d1k4db1, region B:1-107 [Jmol] [rasmolscript] [script source]     - Domain d1k4db2, region B:108-212 [Jmol] [rasmolscript] [script source]     - Domain d1k4dc_, 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: [1k4d_C] [1k4d_B] [1k4d] [1k4d_A] 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 1K4D: [IG_like] [IGv ] by SMART

Other resources with information on 1K4D

Community annotation for 1K4D at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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