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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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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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ATP Driven Pumps I: An Overview01:27

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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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Protein Transport into the Inner Mitochondrial Membrane01:34

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Energy to Drive Translocation01:37

Energy to Drive Translocation

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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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Protein Transport to the Thylakoids01:22

Protein Transport to the Thylakoids

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Thylakoids are membrane-bound sac-like structures within the chloroplast that serve as sites for photosynthesis. Thylakoid lumen contains many electron transport proteins and is enclosed by a thylakoid membrane rich in the light-harvesting complex. Proteins targeted to the thylakoids are transported as precursors and are sorted by the general TOC/TIC import pathway. Once the precursor reaches the stroma, stromal processing peptidases remove their transit signal and expose thylakoid signal...
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Proton transport through one-atom-thick crystals.

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Atomically thin membranes like graphene and hexagonal boron nitride (hBN) show high permeability to thermal protons, enabling new hydrogen-based technologies. Thicker crystal layers, however, block proton transport, highlighting the unique properties of single-atom-thick materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Graphene and hexagonal boron nitride (hBN) are atomically thin materials with potential for advanced separation technologies.
  • Perfect graphene monolayers are typically impermeable to atoms and molecules under ambient conditions.
  • Proton transport through such thin materials is unexpected and warrants investigation.

Purpose of the Study:

  • To investigate the proton permeability of atomically thin crystal membranes, specifically graphene and hBN.
  • To compare proton transport in monolayer versus multilayer structures.
  • To explore factors influencing proton conductivity, such as temperature and nanoparticle decoration.

Main Methods:

  • Transport measurements
  • Mass spectroscopy
  • Proton conductivity and resistivity measurements
  • Activation energy determination

Main Results:

  • Monolayers of graphene and hBN exhibit high permeability to thermal protons, unlike thicker crystal layers.
  • Monolayer hBN shows the highest room-temperature proton conductivity with low activation energy.
  • Graphene's proton resistivity decreases significantly at higher temperatures (>250°C).
  • Catalytic metal nanoparticles enhance proton transport through these membranes.

Conclusions:

  • Atomically thin graphene and hBN are highly conductive to protons, challenging previous assumptions about their impermeability.
  • These materials demonstrate significant potential for applications in hydrogen-based technologies due to their selective proton conductivity and stability.
  • Further research into the proton transport mechanism in these 2D materials is needed.