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15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale
Published on: April 19, 2021
Probar las interacciones residuales en estados de proteínas desplegadas utilizando técnicas de relajación de espín de
1Protein Engineering Network Centers of Excellence, University of Toronto, Toronto, Ontario, Canada M5S 1A8. choy@pound.med.utoronto.ca
Journal of the American Chemical Society
|September 25, 2003
Resumen
Interacciones residuales en la nucleasa del estafilococo.
Área de la Ciencia:
- La biofísica es la biofísica.
- Dinámica de las proteínas Dinámica de las proteínas.
- 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) 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)
Sus antecedentes:
- La nucleasa del estafilococo delta131delta es un fragmento de proteína grande y intrínsecamente desordenado.
- Comprender las interacciones residuales en proteínas desordenadas es crucial para comprender su función.
- La dinámica de las proteínas ocurre a través de varias escalas de tiempo, influyendo en el comportamiento de las proteínas.
Objetivo del estudio:
- Para investigar el impacto del pH en las interacciones residuales y dinámicas en delta131delta.
- Para caracterizar los movimientos dependientes de la escala de tiempo dentro de este fragmento de proteína desordenada.
Principales métodos:
- Utilizó técnicas de relajación de espín de RMN de columna vertebral (15) N y metilo de cadena lateral (2) H. Técnicas de relajación de espín de RMN.
- Probó la dinámica de las proteínas a dos valores de pH distintos (pH 3 y pH 5).
Principales resultados:
- Los movimientos en escala de tiempo de picosegundos de las cadenas vertebrales y laterales se mantuvieron en gran medida sin cambios en los valores de pH.
- Se observaron aumentos significativos en los movimientos de la escala de tiempo de nanosegundos a pH 3 en comparación con pH 5.
- Estos hallazgos sugieren una interrupción dependiente del pH de los contactos hidrofóbicos residuales.
Conclusiones:
- La reducción del pH de 5 a 3 interrumpe los contactos hidrofóbicos residuales en el delta131delta.
- Las repulsiones electrostáticas se vuelven dominantes a un pH más bajo, lo que lleva a un aumento de la dinámica de las proteínas.
- La relajación del espín de RMN es efectiva para caracterizar la dinámica dependiente del pH en proteínas desordenadas.
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