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Modeling iron-catecholates binding to NGAL protein.

Cristina Gómez-Casado1, Franziska Roth-Walter, Erika Jensen-Jarolim

  • 1Centro de Biotecnología y Genómica de Plantas (CBGP), Campus de Montegancedo, Universidad Politécnica de Madrid (UPM), 28223 Madrid, Spain.

Journal of Molecular Graphics & Modelling
|September 11, 2013
PubMed
Summary
This summary is machine-generated.

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Neutrophil gelatinase-associated lipocalin (NGAL) binds iron-catecholate ligands, impacting bacterial iron acquisition. Computational methods reveal detailed interactions, including hydrogen bonds and electrostatic effects within NGAL

Area of Science:

  • Biochemistry and Molecular Biology
  • Computational Chemistry
  • Structural Biology

Background:

  • Neutrophil gelatinase-associated lipocalin (NGAL) exhibits antibacterial properties by sequestering iron.
  • NGAL competes with bacterial siderophores for iron, crucial for pathogen survival.
  • Recent findings indicate NGAL's ability to bind Fe(III) complexed with catechols.

Purpose of the Study:

  • To investigate the selective binding of NGAL to iron-catecholate ligands.
  • To elucidate the molecular interactions governing Fe(III)-catecholate binding to NGAL.
  • To establish a computational model for in silico exploration of NGAL-ligand interactions.

Main Methods:

  • Quantum chemical calculations (B3LYP/6-311G(d,p)) for ligand properties.
Keywords:
CatecholsElectrostatic potentialIron chelatorsLipocalinsProtein–ligand dockingProtein–ligand interfaces

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  • Flexible protein-ligand docking simulations.
  • Analysis of protein-ligand interfaces and electrostatic potentials (Poisson-Boltzmann).

    • Main Results:

    • Detailed characterization of NGAL's binding to Fe(III) with varying catecholate coordination.
    • Identification of key electrostatic interactions and hydrogen bonding networks in the NGAL binding pocket.
    • Computational modeling provides insights into the selectivity of iron-catecholate binding.

    Conclusions:

    • NGAL selectively binds Fe(III)-catecholate complexes through specific electrostatic and hydrogen bonding interactions.
    • The study provides a robust computational framework for understanding NGAL's ligand-binding mechanisms.
    • Findings contribute to understanding NGAL's role in innate immunity and potential therapeutic strategies.