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Electron Transport Chain: Complex I and II01:46

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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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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 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 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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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Bacterial formate hydrogenlyase complex.

Jennifer S McDowall1, Bonnie J Murphy2, Michael Haumann3

  • 1Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland;

Proceedings of the National Academy of Sciences of the United States of America
|August 27, 2014
PubMed
Summary
This summary is machine-generated.

Researchers isolated the intact formate hydrogenlyase (FHL) complex from Escherichia coli, a key enzyme for biohydrogen production. This breakthrough enables further study of FHL

Keywords:
PFEbacterial hydrogen metabolism

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Area of Science:

  • Biochemistry
  • Microbiology
  • Bioenergetics

Background:

  • Escherichia coli produces molecular hydrogen via mixed-acid fermentation under anaerobic conditions.
  • The membrane-bound formate hydrogenlyase (FHL) complex is directly responsible for this hydrogen production.
  • Previous understanding of FHL was limited by the inability to isolate the intact complex for biochemical analysis.

Purpose of the Study:

  • To develop genetic tools for the facile isolation of the intact FHL complex.
  • To characterize the composition and activity of the isolated FHL complex.
  • To advance biohydrogen research by understanding FHL's function.

Main Methods:

  • Development of novel genetic tools for FHL isolation.
  • Single-step chromatographic purification of the FHL complex.
  • In vitro enzymatic activity assays.
  • Protein film electrochemistry on the [NiFe] hydrogenase component (Hyd-3).

Main Results:

  • The FHL complex was successfully isolated in an intact form using a single chromatographic step.
  • The core complex consists of HycE (Hyd-3), FdhF, HycB, HycF, and HycG, with some association of membrane proteins HycC and HycD.
  • The isolated FHL complex retained formate hydrogenlyase activity in vitro.
  • The Hyd-3 component demonstrated unique H2 production capabilities even at high H2 partial pressures.

Conclusions:

  • The developed genetic tools allow for the isolation and biochemical analysis of the intact FHL complex.
  • The FHL complex's composition and enzymatic activity have been elucidated.
  • The unique properties of the Hyd-3 component offer new insights for biohydrogen production technologies.