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Related Concept Videos

Electron Transport Chain Components01:29

Electron Transport Chain Components

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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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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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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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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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Related Experiment Video

Updated: Sep 23, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Concerted Electron-Nuclear Motion in Proton-Coupled Electron Transfer-Driven Grotthuss-Type Proton Translocation.

Eric A Arsenault1,2,3, Walter D Guerra4, James Shee1,5

  • 1Department of Chemistry, University of California, Berkeley, California 94720, United States.

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This study reveals a biomimetic construct enabling photoinduced proton-coupled electron transfer and two-proton transport. Ultrafast spectroscopy shows these processes are concerted, offering new insights into hot charge transfer.

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Area of Science:

  • Physical Chemistry
  • Biomimetic Chemistry
  • Spectroscopy

Background:

  • Proton-coupled electron transfer (PCET) is crucial in biological systems.
  • Understanding long-range proton transport mechanisms is key to energy conversion.
  • Biomimetic constructs offer models for complex chemical processes.

Purpose of the Study:

  • To investigate photoinduced proton-coupled electron transfer (PCET).
  • To study long-range two-proton transport via a Grotthuss-type mechanism.
  • To characterize the ultrafast, nonequilibrium dynamics of these processes in a biomimetic system.

Main Methods:

  • Two-dimensional electronic vibrational spectroscopy (2D-EVS).
  • Electrochemical techniques.
  • Computational simulations.

Main Results:

  • Identified a low-frequency mode promoting concerted double proton and electron transfer.
  • Observed directly coupled nuclear and electronic degrees of freedom.
  • Characterized the nonequilibrium pathway with a time scale of ~110 fs.

Conclusions:

  • Double proton and electron transfer processes are concerted within 24 fs.
  • The study provides a new method for investigating hot charge transfer.
  • Findings advance understanding of electron and proton dynamics in artificial systems.