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La unión del borato a los sideróforos: estructura y estabilidad.

Wesley R Harris1, Shady A Amin, Frithjof C Küpper

  • 1Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, USA.

Journal of the American Chemical Society
|September 14, 2007
PubMed
Resumen

Ciertos sideróforos se unen al boro, no sólo al hierro. Esta afinidad inesperada, dependiente de grupos químicos específicos, sugiere roles en la señalización celular marina y la absorción de boro.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Química del medio ambiente Química del medio ambiente
  • Microbiología Microbiología.

Sus antecedentes:

  • Los sideróforos son quelantes bacterianos del hierro.
  • El boro es esencial en los ambientes marinos.
  • Las funciones biológicas del boro no se comprenden completamente.

Objetivo del estudio:

  • Investigar las interacciones sideróforo-boro.
  • Determinar los requisitos estructurales para la unión de boro.
  • Explorar las posibles funciones biológicas de los complejos boro-sideróforo.

Principales métodos:

  • Espectrometría de masas de ionización por electrospray (ESI-MS).
  • Espectroscopia de Resonancia Magnética Nuclear (RMN) Multinuclear Espectroscopia de Resonancia Magnética Nuclear (RMN) Multinuclear Espectroscopia de Resonancia Magnética Nuclear (RMN) Multinuclear Espectroscopia de Resonancia Magnética Nuclear (RMN) Multinuclear Espectroscopia de Resonancia Magnética Nuclear (RMN) Multinuclear Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN).
  • Cálculos de la Teoría Funcional de la Densidad (DFT).
  • Medición de las constantes de unión del boro.

Principales resultados:

  • Los sideróforos con grupos de citrato o catecolatos se unen al boro.
  • Se caracterizan los complejos de boro con vibrioferrina, rizoferina y petrobactina.
  • Constantes significativas de unión del boro medidas en el pH oceánico.
  • La unión del boro induce una distinta conformación del sideróforo.

Conclusiones:

  • Los sideróforos específicos exhiben una inesperada afinidad con el boro.
  • Los complejos de boro-sideróforo pueden formarse en entornos marinos.
  • Se hipotetizan roles potenciales en la absorción biológica de boro y la señalización celular.
  • Los cambios de conformación permiten la diferenciación entre las funciones de unión de hierro y boro.