1XK4	Metal Binding Protein	date	Sep 26, 2004
title	Crystal Structure Of Human Calprotectin(S100a8s100a9)
authors	I.P.Korndoerfer, F.Brueckner, A.Skerra
compound		source
Molecule: Calgranulin A Chain: A, B, E, F, I, J Synonym: S100 Calcium-Binding Protein A8, S100a8, Migration Inhibitory Factor-Related Protein 8, Mrp-8, P8, Cystic Fibr Antigen, Cfag, Leukocyte L1 Complex Light Chain, Calprotect Engineered: Yes Mutation: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Gene: S100a8 Expression_system: Escherichia Coli Bl21(De3) Expression_system_taxid: 469008 Expression_system_strain: Bl21(De3) Expression_system_vector_type: Plasmid Expression_system_plasmid: Pet-36b(+)-Mrp8c42s
Molecule: Calgranulin B Chain: C, D, G, H, K, L Synonym: S100 Calcium-Binding Protein A9, S100a9, Migration Inhibitory Factor-Related Protein 14, Mrp-14, P14, Leucocyt Complex Heavy Chain, Calprotectin L1h Subunit; Engineered: Yes Mutation: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Gene: S100a9 Expression_system: Escherichia Coli Bl21(De3) Expression_system_taxid: 469008 Expression_system_strain: Bl21(De3) Expression_system_vector_type: Plasmid Expression_system_plasmid: Pet-36b(+)-Mrp14c3s
symmetry	Space Group: P 1 21 1	R_factor 0.158 R_Free 0.205
crystal cell	length a length b length c angle alpha angle beta angle gamma 48.509 78.697 177.411 90.00 94.94 90.00
method	X-Ray Diffraction	resolution	1.80 Å
ligand	CA, CL, FLC	enzyme
note	1XK4 is a representative structure
Gene Ontology	Chain Function Process Component F, A, J, E, B, I K, H, C, D, G, L antioxidant activity
Primary reference	The crystal structure of the human (S100A8/S100A9)2 heterotetramer, calprotectin, illustrates how conformational changes of interacting alpha-helices can determine specific association of two EF-hand proteins., Korndorfer IP, Brueckner F, Skerra A, J Mol Biol. 2007 Jul 27;370(5):887-98. Epub 2007 May 3. PMID:17553524

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (213 Kb) [Save to disk] Biological Unit Coordinates (1xk4.pdb1.gz) 69 Kb Biological Unit Coordinates (1xk4.pdb2.gz) 69 Kb Biological Unit Coordinates (1xk4.pdb3.gz) 69 Kb LPC: Ligand-Protein Contacts for 1XK4 CSU: Contacts of Structural Units for 1XK4 Likely Quarternary Molecular Structure file(s) for 1XK4 Structure Factors (973 Kb) Retrieve 1XK4 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1XK4 from S2C, [Save to disk] Re-refined 1xk4 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1XK4 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 1XK4

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 1XK4, from MSDmotif at EBI

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [1xk4_C] [1xk4_B] [1xk4_G] [1xk4_L] [1xk4_F] [1xk4_H] [1xk4_A] [1xk4_K] [1xk4_E] [1xk4_J] [1xk4_I] [1xk4] [1xk4_D] SWISS-PROT database: [P05109] [P06702] Domain organization of [S10A8_HUMAN] [S10A9_HUMAN] by SWISSPFAM Domain found in 1XK4: [S_100 ] by SMART

Other resources with information on 1XK4

Community annotation for 1XK4 at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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