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Related Concept Videos

The Antenna Complex01:15

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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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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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Channel Rhodopsins01:11

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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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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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Photosystems01:32

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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.
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The Photochemical Reaction Center01:29

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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Related Experiment Video

Updated: Feb 28, 2026

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
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Light harvesting in phototrophic bacteria: structure and function.

Rafael G Saer1,2, Robert E Blankenship3,2,4

  • 1Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, U.S.A.

The Biochemical Journal
|June 15, 2017
PubMed
Summary

This review introduces diverse light-harvesting structures in phototrophic prokaryotes, detailing their architectures and energy transfer in various bacteria. It highlights recent findings and future research directions in photosynthesis.

Keywords:
bacteriochlorophyllchlorophyllenergy transferlight harvestingnear-infrared spectroscopytime-resolved spectroscopy

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Area of Science:

  • Microbiology
  • Biochemistry
  • Photosynthesis Research

Background:

  • Phototrophic prokaryotes utilize diverse light-harvesting (LH) systems for photosynthesis.
  • These systems are adapted to various habitats and light conditions.
  • Photosynthesis can be oxygenic (oxygen-evolving) or anoxygenic (non-oxygen-evolving).

Purpose of the Study:

  • To provide an introductory overview of light-harvesting structures in phototrophic prokaryotes.
  • To detail the architecture, energy transfer rates, and pathways within these complexes.
  • To discuss recent advancements and identify areas for future investigation.

Main Methods:

  • Review of existing literature on light-harvesting complexes.
  • Comparative analysis of structures across different bacterial groups.
  • Synthesis of recent findings on pigment-protein complexes and energy transfer.

Main Results:

  • Overview of LH complexes in purple bacteria, green sulfur bacteria (GSB), acidobacteria, filamentous anoxygenic phototrophs (FAP), and cyanobacteria.
  • Emphasis on the architectural organization of pigment-protein complexes.
  • Inclusion of energy transfer kinetics and recent structural data (e.g., CsmA baseplate).

Conclusions:

  • Bacterial light-harvesting systems exhibit remarkable diversity and adaptation.
  • Understanding these structures is crucial for comprehending photosynthetic efficiency.
  • Further research is needed to fully elucidate energy transfer mechanisms and complex structures.