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Electron Transport Chain Components01:29

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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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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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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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Synthesis and Mass Spectrometry Analysis of Oligo-peptoids
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Single-Molecule Electron Transport in Peptoids.

Brittany Prempin1,2, Rajarshi Samajdar2,3, Hemani Chhabra2

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The Journal of Physical Chemistry. B
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Summary
This summary is machine-generated.

Peptoid molecular electronics reveal sequence-dependent electron transport. Aromatic side groups and specific N-Cα substitutions enable predictable conductance, differing from hydrogen-bonded peptides.

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Area of Science:

  • Molecular electronics
  • Materials science
  • Supramolecular chemistry

Background:

  • Peptoids, peptide analogs, offer sequence-defined modularity for advanced materials.
  • Understanding peptoid electron transport is crucial for molecular electronics applications.
  • Current knowledge gaps exist regarding sequence and conformation effects on peptoid conductance.

Purpose of the Study:

  • To investigate the influence of sequence and conformation on electron transport in peptoid oligomers.
  • To characterize the molecular electronic properties of peptoids using experimental and computational methods.
  • To establish design rules for peptoid-based molecular junctions.

Main Methods:

  • Synthesis of a peptoid oligomer library.
  • Scanning tunneling microscope-break junction (STM-BJ) technique for electronic property characterization.
  • All-atom molecular dynamics (MD) simulations and NEGF-DFT calculations for conformational and electronic analysis.

Main Results:

  • Well-defined electron transport observed in peptoids with aromatic side groups and no N-Cα substitution.
  • Peptoid conductance differs from peptides, where H-bonds increase conductance.
  • Computational results qualitatively agree with experimental findings.
  • Conductance is sensitive to monomer identity, side-chain aromaticity, and N-Cα substitution.

Conclusions:

  • Peptoid conductance is tunable via sequence and monomer identity.
  • Design rules for peptoid molecular junctions are established.
  • This study advances the understanding of structure-function relationships in peptoid-based molecular electronics.