Neutrophil gelatinase associated lipocalin (NGAL) protein is attracting a great interest because of its
antibacterial properties played upon modulating iron content in competition against iron acquisition pro-cesses developed by pathogenic bacteria that bind selective ferric iron chelators (siderophores). Besides
its known high affinity to enterobactin, the most important siderophore, it has been recently shown that
NGAL is able to bind Fe(III) coordinated by catechols. The selective binding of Fe(III)-catechol ligands to
NGAL is here studied by using iron coordination structures with one, two, and three catecholate ligands.
By means of a computational approach that consists of B3LYP/6-311G(d,p) quantum calculations for
geometries, electron properties and electrostatic potentials of ligands, protein–ligand flexible docking
calculations, analyses of protein–ligand interfaces, and Poisson–Boltzmann electrostatic potentials for
proteins, we study the binding of iron catecholate ligands to NGAL as a central member of the lipocalin
family of proteins. This approach provides a modeling basis for exploring in silico the selective binding
of iron catecholates ligands giving a detailed picture of their interactions in terms of electrostatic effects
and a network of hydrogen bonds in the protein binding pocket
Neutrophil gelatinase associated lipocalin (NGAL) protein is attracting a great interest because of its
antibacterial properties played upon modulating iron content in competition against iron acquisition pro-cesses developed by pathogenic bacteria that bind selective ferric iron chelators (siderophores). Besides
its known high affinity to enterobactin, the most important siderophore, it has been recently shown that
NGAL is able to bind Fe(III) coordinated by catechols. The selective binding of Fe(III)-catechol ligands to
NGAL is here studied by using iron coordination structures with one, two, and three catecholate ligands.
By means of a computational approach that consists of B3LYP/6-311G(d,p) quantum calculations for
geometries, electron properties and electrostatic potentials of ligands, protein–ligand flexible docking
calculations, analyses of protein–ligand interfaces, and Poisson–Boltzmann electrostatic potentials for
proteins, we study the binding of iron catecholate ligands to NGAL as a central member of the lipocalin
family of proteins. This approach provides a modeling basis for exploring in silico the selective binding
of iron catecholates ligands giving a detailed picture of their interactions in terms of electrostatic effects
and a network of hydrogen bonds in the protein binding pocket
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