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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

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Designing Silk-silk Protein Alloy Materials for Biomedical Applications
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La unión selectiva al sitio de los metales mediante péptidos alfa-hélicos diseñados.

Manolis Matzapetakis1, Vincent L Pecoraro

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA.

Journal of the American Chemical Society
|December 22, 2005
PubMed
Resumen

Los péptidos TRI diseñados con sustituciones específicas de cisteína demuestran un enlace de iones de cadmio (Cd(II)) específico del sitio. Este sistema de péptidos logra el reconocimiento selectivo de metales sin grandes andamios de proteínas.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Diseño de péptidos diseño de péptidos.
  • Química bioorgánica Química bioorgánica.

Sus antecedentes:

  • La familia de péptidos TRI, con estructuras alfa-hélices, puede unirse a los iones de cadmio (II) (Cd (II)).
  • La afinidad de unión al cadmio en los péptidos TRI varía con el sitio de sustitución de cisteína (sitio a vs. d).

Objetivo del estudio:

  • Investigar si se pueden diseñar afinidades de unión diferenciales en péptidos sustituidos por di-cisteína para el reconocimiento de iones específicos del sitio.
  • Explorar el potencial de péptidos de diseño corto para la unión selectiva de metales.

Principales métodos:

  • Utilizó el péptido sustituido por di-cisteína TRI L9CL19C.
  • Empleado 113Cd Resonancia Magnética Nuclear (RMN), 1H RMN y espectroscopias dicroicas circulares.

Principales resultados:

  • 1 equivalente de Cd (II) se une exclusivamente a la cisteína del sitio "a".
  • El segundo sitio de cisteína se llena sólo después de que el primer sitio se llena.
  • Reconocimiento de iones específico del sitio demostrado en un sistema de péptidos diseñado.

Conclusiones:

  • El sistema TRI es el primero en mostrar péptidos estequiométricamente equivalentes con diferentes secuencias que permiten el reconocimiento de iones específicos del sitio.
  • Se atribuyen diferentes afinidades metálicas a los conformadores de cisteína en diferentes puntos de sustitución.
  • La selectividad del sitio puede codificarse en péptidos helicoidales cortos, reduciendo la dependencia de andamios proteicos extensos.