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Protein Crystallization for X-ray Crystallography
Published on: January 16, 2011
Recristalización inducida por el estrés de un cristal de proteína por irradiación de electrones
F Zemlin1, R Schuster, E Beckmann
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany.
Nature
|May 20, 1999
Resumen
Los cristales de proteínas dañados por la radiación pueden reordenarse y recristalizarse. Este cambio estructural es impulsado por el estrés de los defectos, no el calor, a bajas temperaturas, ofreciendo una nueva vía para el autoensamblaje del material.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La cristalografía es una técnica de cristalografía.
- La biofísica es la biofísica.
Sus antecedentes:
- Los sistemas termodinámicos generalmente alcanzan estabilidad a través del transporte de masa activado térmicamente.
- Las bajas temperaturas y las altas barreras de activación pueden evitar el equilibrio, como se ve en vidrios y materiales granulares.
- El aumento de la fuerza motriz puede superar las barreras de activación, iniciando cambios estructurales.
Objetivo del estudio:
- Para investigar el reordenamiento de los cristales de proteínas dañadas por la radiación.
- Para explorar el transporte de masas iniciado por el estrés en lugar de la activación térmica.
- Comprender los mecanismos de reordenamiento inducidos por defectos en las estructuras cristalinas.
Principales métodos:
- Observación de cristales de proteínas utilizando microscopía electrónica de transmisión.
- Inducir daños por radiación para crear defectos dentro de la red de cristal.
- Analizando el reordenamiento de cristales bajo estrés a bajas temperaturas.
Principales resultados:
- Se observó que los cristales de proteínas dañados por la radiación se recristalizan después de la acumulación de defectos.
- El reordenamiento fue inducido por el estrés generado por los defectos inducidos por la radiación.
- Los cambios estructurales se produjeron a temperaturas demasiado bajas para un transporte de masas difusivo significativo.
Conclusiones:
- El estrés inducido por un defecto puede impulsar el reordenamiento de los materiales cristalinos.
- Este reordenamiento mediado por el estrés ocurre independientemente de la activación térmica a bajas temperaturas.
- El fenómeno del reordenamiento inducido por un defecto puede ser ampliamente aplicable en varios sistemas.
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