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Electron Transport Chain: Complex III and IV01:43

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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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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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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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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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A four-helix bundle stores copper for methane oxidation.

Nicolas Vita1, Semeli Platsaki1, Arnaud Baslé1

  • 1Institute for Cell and Molecular Biosciences, Medical School, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.

Nature
|August 27, 2015
PubMed
Summary
This summary is machine-generated.

Researchers discovered a novel copper storage protein (Csp1) in methane-oxidizing bacteria. This protein is crucial for storing copper needed for methane oxidation, a process vital for controlling greenhouse gases and biotechnological applications.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Environmental Science

Background:

  • Methane-oxidizing bacteria (methanotrophs) utilize copper-dependent methane monooxygenases for methane oxidation.
  • Methane monooxygenases are key in regulating atmospheric methane, a potent greenhouse gas.
  • Methanotrophs offer significant potential in bioremediation, chemical synthesis, and bioenergy.

Purpose of the Study:

  • To discover and characterize a novel copper storage protein in *Methylosinus trichosporium* OB3b.
  • To elucidate the mechanism of copper storage for methane oxidation in methanotrophs.
  • To understand the biotechnological implications of copper storage in methanotrophs.

Main Methods:

  • Isolation and characterization of the novel copper storage protein (Csp1).
  • Structural analysis of Csp1, including its quaternary structure and copper-binding sites.
  • Investigation of Csp1's role in copper homeostasis for methane monooxygenase activity.

Main Results:

  • Discovery of Csp1, an exported copper storage protein in *Methylosinus trichosporium* OB3b.
  • Csp1 is a tetramer with a unique copper-binding mechanism involving cysteine residues.
  • Csp1 stores copper within a known protein-folding motif, a novel finding for metal storage proteins.
  • Identification of cytosolic Csp1 homologues in diverse bacteria, challenging previous assumptions about copper usage.

Conclusions:

  • Csp1 plays a critical role in copper accumulation for particulate methane monooxygenase in methanotrophs.
  • The unique structure and function of Csp1 provide key insights into copper metabolism in bacteria.
  • Understanding Csp1 is essential for harnessing the full biotechnological potential of methanotrophs.