1XK4		date
authors
compound		source
symmetry		R_factor R_Free
crystal cell	length a length b length c angle alpha angle beta angle gamma
method	X-Ray Diffraction	resolution
ligand	CA, CL, FLC	enzyme
note	1XK4 is a representative structure
Gene Ontology	Chain Function Process Component I, J, B, F, A, E L, K, D, H, C, G 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.

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute

Sequence-derived information

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

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