The Copper (ii) And Zinc (ii) Coordination Mode Of Hexxh And Hxxeh Motif In Small Peptides: The Role Of Carboxylate Location And Hydrogen Bonding Network
The Copper (ii) And Zinc (ii) Coordination Mode Of Hexxh And Hxxeh Motif In Small Peptides: The Role Of Carboxylate Location And Hydrogen Bonding Network(630 views) GrassoG, Magrì A, Bellia F, Pietropaolo A, La Mendola D, Rizzarelli E
Dipartimento di Scienze Chimiche, Universit Degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy
Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale Delle Ricerche (CNR) Catania, Viale A. Doria 6, 95125 Catania, Italy
Dipartimento di Farmacia, Universit di Pisa, Via Bonanno Pisano 6, 56126 Pisa, Italy
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The Copper (ii) And Zinc (ii) Coordination Mode Of Hexxh And Hxxeh Motif In Small Peptides: The Role Of Carboxylate Location And Hydrogen Bonding Network
Copper (II) and zinc (II) complexes with two hexapeptides encompassing HExxH and HxxEH motif were characterized by means of a combined experimental and theoretical approach. Parallel tempering and density functional theory (DFT) investigations show the presence of different hydrogen bonding networks between the copper (II) and zinc (II) complexes with the two peptides, suggesting a significant contribution of these non-covalent interactions to the stability constant values. The glutamate carboxylate group has a direct role in metal ion binding. The location of this amino acid along the sequence of the investigated peptides is critical to determine thermodynamic and spectroscopic features of the copper (II) complex species, whereas is less relevant in the zinc (II) complexes formation. Electrospray ionization mass spectrometry (ESI-MS) characterization of the zinc (II) complex species show that in the [ZnH-2L] two deprotonated amide nitrogen atoms are involved in the metal coordination environment, an uncommon behavior in zinc (II) complexes for multi-histidine ligands. (C) 2013 Elsevier Inc. All rights reserved
The Copper (ii) And Zinc (ii) Coordination Mode Of Hexxh And Hxxeh Motif In Small Peptides: The Role Of Carboxylate Location And Hydrogen Bonding Network
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The Copper (ii) And Zinc (ii) Coordination Mode Of Hexxh And Hxxeh Motif In Small Peptides: The Role Of Carboxylate Location And Hydrogen Bonding Network