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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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Chemiosmosis and ATP Synthesis01:22

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The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...
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Tutorial sobre el cálculo de las constantes de velocidad de transferencia de electrones acoplados a protones no

Phillips Hutchison1, Kai Cui2, Jiayun Zhong2

  • 1Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.

The Journal of chemical physics
|September 5, 2025
PubMed
Resumen
Este resumen es generado por máquina.

La transferencia de electrones acoplados a protones (PCET) es fundamental en todas las ciencias. Este tutorial detalla el cálculo de las constantes de velocidad PCET, incluidos los efectos cuánticos como el túnel de protones, utilizando el paquete pyPCET para diversos sistemas.

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Área de la Ciencia:

  • Ciencias multidisciplinarias
  • Física y química
  • La biofísica

Sus antecedentes:

  • La transferencia de electrones acoplados a protones (PCET) es un proceso fundamental en química, biología y física.
  • Se ha desarrollado un marco teórico general para el PCET, que incorpora efectos mecánicos cuánticos de electrones y protones, túnel de hidrógeno, reorganización ambiental y fluctuaciones de donante-aceptante.
  • Se han derivado constantes de velocidad analíticas para varios regímenes, con un enfoque en el régimen vibrónicamente no adiabático.

Objetivo del estudio:

  • Proporcionar un tutorial sobre el cálculo de las cantidades de entrada para las constantes de velocidad PCET en el régimen vibrónicamente no adiabático.
  • Detallar el cálculo de las energías de reorganización de la esfera interna y la esfera externa, los potenciales de protones diabéticos, el acoplamiento electrónico, la energía libre de reacción y la distribución de la distancia entre el donante y el receptor de protones.
  • Para guiar la determinación de la no adiabaticidad electrón-protón para el acoplamiento vibratorio.

Principales métodos:

  • Centrarse en la regla de oro de la expresión constante de velocidad aplicable al régimen vibrónicamente no adiabático.
  • Instrucciones detalladas para el cálculo de los parámetros de entrada esenciales de los sistemas PCET.
  • Aplicación de métodos a diversos sistemas, incluidos el PCET enzimático, el electroquímico molecular homogéneo, el fotoquímico molecular y el electroquímico heterogéneo.

Principales resultados:

  • Proporciona una guía completa para el cálculo de las constantes de velocidad PCET.
  • Demuestra la aplicación de la formulación teórica mediante ejemplos detallados.
  • Introduce el paquete Python disponible públicamente, pyPCET, para el cálculo de las constantes de velocidad PCET no adiabáticas.

Conclusiones:

  • El tutorial equipa a los investigadores con las herramientas y el conocimiento necesarios para calcular las constantes de la tasa de PCET.
  • El paquete pyPCET facilita la aplicación de métodos teóricos avanzados a varios sistemas PCET.
  • Este trabajo mejora la comprensión y la accesibilidad computacional de procesos PCET complejos en todas las disciplinas científicas.