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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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The Significance of Membrane Transport01:44

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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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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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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Electron Transport Across Bacterial Cell Envelopes.

Joshua A J Burton1, Marcus J Edwards2, David J Richardson1

  • 1School of Biological Sciences, University of East Anglia, Norwich, United Kingdom;

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|March 17, 2025
PubMed
Summary
This summary is machine-generated.

Microorganisms use extracellular electron transfer to interact with their environment, impacting geochemistry. This study reviews known pathways and uses protein models to explore novel mechanisms for electron exchange.

Keywords:
GeobacterShewanellaextracellular electron transfermultiheme cytochromeporin–cytochromeprotein modeling

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Area of Science:

  • Microbiology
  • Biochemistry
  • Environmental Science

Background:

  • Extracellular electron transfer (EET) is a vital microbial process for energy conservation and biogeochemical cycling.
  • Microbial EET influences the solubility and speciation of environmental redox-active compounds like metal oxides.
  • Understanding EET mechanisms is crucial for comprehending microbial survival in nutrient-limited environments.

Purpose of the Study:

  • To review characterized extracellular electron transfer pathways in microorganisms.
  • To investigate novel electron transfer proteins and complexes using protein modeling.
  • To gain insight into the interaction mechanisms of EET complexes with environmental substrates.

Main Methods:

  • Literature review of known microbial extracellular electron transfer pathways.
  • Application of protein modeling tools to analyze hypothetical electron transfer proteins and complexes.
  • Comparative analysis of structural features for substrate interaction.

Main Results:

  • Identification of key features in protein models potentially involved in electron transfer across cell envelopes.
  • Hypothetical models suggest mechanisms for interaction with diverse environmental substrates.
  • The study provides new structural insights into previously uncharacterized electron transfer components.

Conclusions:

  • Extracellular electron transfer pathways are diverse and essential for microbial life and environmental processes.
  • Protein modeling offers a valuable approach to hypothesize and explore novel EET mechanisms.
  • Further research is needed to experimentally validate these hypothetical models and their functions.