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• W2079666836 endingPage "3180" @default.
• W2079666836 startingPage "3168" @default.
• W2079666836 abstract "The role of the second shell in the process of metal binding and selectivity in metalloproteins has been elucidated by combining Protein Data Bank (PDB) surveys of Mg, Mn, Ca, and Zn binding sites with density functional theory/continuum dielectric methods (DFT/CDM). Peptide backbone groups were found to be the most common second-shell ligand in Mg, Mn, Ca, and Zn binding sites, followed (in decreasing order) by Asp/Glu, Lys/Arg, Asn/Gln, and Ser/Thr side chains. Aromatic oxygen- or nitrogen-containing side chains (Tyr, His, and Trp) and sulfur-containing side chains (Cys and Met) are seldom found in the second coordination layer. The backbone and Asn/Gln side chain are ubiquitous in the metal second coordination layer as their carbonyl oxygen and amide hydrogen can act as a hydrogen-bond acceptor and donor, respectively, and can therefore partner practically every first-shell ligand. The second most common outer-shell ligand, Asp/Glu, predominantly hydrogen bonds to a metal-bound water or Zn-bound histidine and polarizes the H-O or H-N bond. In certain cases, a second-shell Asp/Glu could affect the protonation state of the metal ligand. It could also energetically stabilize a positively charged metal complex more than a neutral ligand such as the backbone and Asn/Gln side chain. As for the first shell, the second shell is predicted to contribute to the metal selectivity of the binding site by discriminating between metal cations of different ionic radii and coordination geometries. The first-shell-second-shell interaction energies decay rapidly with increasing solvent exposure of the metal binding site. They are less favorable but are of the same order of magnitude as compared to the respective metal-first-shell interaction energies. Altogether, the results indicate that the structure and properties of the second shell are dictated by those of the first layer. The outer shell is apparently designed to stabilize/protect the inner-shell and complement/enhance its properties." @default.
• W2079666836 created "2016-06-24" @default.
• W2079666836 creator A5010018908 @default.
• W2079666836 creator A5045806392 @default.
• W2079666836 creator A5054577855 @default.
• W2079666836 creator A5058953306 @default.
• W2079666836 date "2003-02-15" @default.
• W2079666836 modified "2023-09-26" @default.
• W2079666836 title "First−Second Shell Interactions in Metal Binding Sites in Proteins: A PDB Survey and DFT/CDM Calculations" @default.
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• W2079666836 doi "https://doi.org/10.1021/ja0209722" @default.
• W2079666836 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12617685" @default.
• W2079666836 hasPublicationYear "2003" @default.

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