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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
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The Electron Transport Chain01:30

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Electron Transport Chains01:28

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Dynamic Equilibrium02:20

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...

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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale

Published on: March 14, 2019

Protein electron transfer: Dynamics and statistics.

Dmitry V Matyushov1

  • 1Center for Biological Physics, Arizona State University, PO Box 871504, Tempe, Arizona 85287-1504, USA. dmitrym@asu.edu

The Journal of Chemical Physics
|July 19, 2013
PubMed
Summary
This summary is machine-generated.

Biological electron transfer achieves high efficiency by utilizing interfacial dynamics, not minimizing reorganization energy. This "dynamical freezing" mechanism enhances energy transfer efficiency in protein chains, reducing heat loss.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Physical Chemistry

Background:

  • Electron transfer in biological energy chains requires high efficiency to minimize energy loss as heat.
  • Standard models predict minimizing reorganization energy for efficient, unidirectional electron transfer.
  • Protein active sites near flexible, polar interfaces pose a challenge to standard models due to maximized reorganization energy.

Purpose of the Study:

  • To investigate how natural systems achieve efficient electron transfer despite interfacial flexibility.
  • To explore the role of interfacial electrostatic fluctuations and dynamics in protein electron transfer.
  • To reconcile standard electron transfer models with observations in biological systems.

Main Methods:

  • Analysis of interfacial electrostatic fluctuations and their dispersive dynamics.
  • Concept of dynamical freezing (ergodicity breaking) of nuclear modes.
  • Comparison of reorganization energies (curvature and Stokes shift) under dynamical freezing.

Main Results:

  • Interfacial flexibility maximizes, rather than minimizes, reorganization energy.
  • Dynamical freezing of nuclear modes occurs due to timescale separation between interface fluctuations and protein conformational changes.
  • Dynamical freezing leads to distinct reorganization energies, increasing electron transfer efficiency.

Conclusions:

  • Natural electron transfer utilizes interfacial dynamics via dynamical freezing for enhanced efficiency.
  • This mechanism explains efficient energy transfer in protein chains by minimizing heat loss.
  • The findings challenge standard equilibrium thermodynamics models for protein electron transfer.