5k92 | pdb_00005k92

Crystal Structure of an apo Tris-thiolate Binding Site in a de novo Three Stranded Coiled Coil Peptide

spinqualitylabelsall models 5k92, resolution 1.42Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5k92 is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACE, CL, PEG, PGE, ZN NonStd Res: NH2 Related: 5k88, 5kb0, 5kb1, 5kb2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Preorganization and predisposition are important molecular recognition concepts exploited by nature to obtain site-specific and selective metal binding to proteins. While native structures containing an MS3 core are often unavailable in both apo- and holo-forms, one can use designed three-stranded coiled coils (3SCCs) containing tris-thiolate sites to evaluate these concepts. We show that the preferred metal geometry dictates the degree to which the cysteine rotamers change upon metal complexation. The Cys ligands in the apo-form are preorganized for binding trigonal pyramidal species (Pb(II)S3 and As(III)S3) in an endo conformation oriented toward the 3SCC C-termini, whereas the cysteines are predisposed for trigonal planar Hg(II)S3 and 4-coordinate Zn(II)S3O structures, requiring significant thiol rotation for metal binding. This study allows assessment of the importance of protein fold and side-chain reorientation for achieving metal selectivity in human retrotransposons and metalloregulatory proteins. A Crystallographic Examination of Predisposition versus Preorganization in de Novo Designed Metalloproteins.,Ruckthong L, Zastrow ML, Stuckey JA, Pecoraro VL J Am Chem Soc. 2016 Sep 2. PMID:27532255 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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