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In-Chul Yeh1, Gerhard Hummer

  • 1Laboratory of Chemical Physics, Building 5, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.

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|June 6, 2002
PubMed
Resumen
Este resumen es generado por máquina.

Las simulaciones de dinámica molecular revelan que los contactos de extremo a extremo del péptido se forman rápidamente, dentro de 10 ns. Este hallazgo se alinea con las mediciones experimentales de las vidas de los tripletes de triptófano, ofreciendo información sobre los primeros eventos de plegamiento de proteínas.

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Área de la Ciencia:

  • La biofísica es la biofísica.
  • Química computacional es la química computacional.
  • Dinámica del plegamiento de las proteínas.

Sus antecedentes:

  • Recientemente se realizaron mediciones experimentales de las tasas de formación de contactos de extremo a extremo del péptido utilizando el enfriamiento de tripletes de triptófano.
  • La comprensión de la cinética de cierre del bucle peptídico es crucial para elucidar los primeros eventos en el plegamiento de las proteínas.

Objetivo del estudio:

  • Investigar la cinética de cierre de bucle para dos péptidos de diferentes longitudes utilizando simulaciones de dinámica molecular de solventes explícitos de todos los átomos.
  • Para comparar los resultados de la simulación directamente con los datos experimentales y analizar la dinámica del péptido en el estado desplegado.

Principales métodos:

  • Se llevaron a cabo múltiples simulaciones de dinámica molecular con disolvente explícito todo atómico para péptidos Cys-(Ala-Gly-Gln) n-Trp (n=1, 2) con diferentes condiciones iniciales y campos de fuerza (AMBER, CHARMM).
  • Se recogieron extensos datos de simulación (1.0-0.8 microsegundos para el pentapeptido, ~0.5 microsegundos cada uno para el octapeptido) para el análisis de resolución atómica.
  • Analizó la dinámica del péptido en estado desplegado para investigar los primeros eventos de plegamiento de proteínas.

Principales resultados:

  • Las vidas calculadas en el estado triplet de triptófano estuvieron en el rango de 50-100 ns, consistente con los hallazgos experimentales.
  • Se observaron tasas de formación de contactos de extremo a extremo significativamente más rápidas, con tiempos característicos de menos de 10 ns.
  • Se demostraron tasas similares de formación de contacto entre los campos de fuerza AMBER y CHARMM, a pesar de las variaciones en los conjuntos de conformación de péptidos.

Conclusiones:

  • Las simulaciones de dinámica molecular proporcionan valiosos conocimientos de resolución atómica sobre las primeras dinámicas de plegamiento de proteínas.
  • La formación de contacto de extremo a extremo del péptido es un proceso rápido, que ocurre en escalas de tiempo más rápidas de lo que sugerían anteriormente algunas interpretaciones de datos experimentales.
  • La elección del campo de fuerza (AMBER vs. CHARMM) tiene un impacto mínimo en las tasas calculadas de formación de contacto de extremo a extremo para estos péptidos.