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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
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Photosystems01:32

Photosystems

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
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Photosystem II01:22

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
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Photosystem I01:27

Photosystem I

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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Artificial Photosynthesis: Hybrid Systems.

Yan Ni1, Frank Hollmann2

  • 1Delft University of Technology, Delft, The Netherlands.

Advances in Biochemical Engineering/Biotechnology
|March 19, 2016
PubMed
Summary

Photoredox biocatalysis uses light to drive oxidoreductase enzymes for organic synthesis. This approach offers simpler, robust artificial regeneration of redox equivalents, potentially using water as a reductant.

Keywords:
BiocatalysisOxidation reactionsPhotocatalysisReduction reactions

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Area of Science:

  • Biocatalysis
  • Organic Synthesis
  • Photoredox Catalysis

Background:

  • Oxidoreductases are valuable biocatalysts for organic synthesis, but require efficient redox equivalent regeneration.
  • Current methods often rely on natural electron supply chains, which can be complex.
  • Artificial regeneration approaches offer potential for simplified and more robust catalytic systems.

Purpose of the Study:

  • To critically review the current advancements in photoredox biocatalysis.
  • To explore the use of visible light in driving biocatalytic oxidation and reduction reactions.
  • To highlight the potential of artificial electron transport chains and water as a reductant.

Main Methods:

  • Review of existing literature on photoredox biocatalysis.
  • Analysis of artificial electron transport chains driven by visible light.
  • Examination of water as a potential reductant in biocatalytic cycles.

Main Results:

  • Visible light can accelerate artificial electron transport chains in biocatalysis.
  • Photoredox biocatalysis enables thermodynamically challenging reactions, including water reduction.
  • Artificial regeneration systems show promise for improved simplicity and robustness.

Conclusions:

  • Photoredox biocatalysis represents a significant advancement in sustainable organic synthesis.
  • Visible light-driven artificial regeneration offers a powerful alternative to natural electron supply chains.
  • Further research in this area could unlock new possibilities for green chemistry.