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Related Concept Videos

Photosystem II01:22

Photosystem II

59.9K
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.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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Photosystem I01:27

Photosystem I

52.8K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
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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
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
7.0K
The Photochemical Reaction Center01:29

The Photochemical Reaction Center

4.4K
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...
4.4K
The Antenna Complex01:15

The Antenna Complex

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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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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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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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Related Experiment Video

Updated: May 4, 2026

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
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Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues

Published on: February 3, 2023

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Photosystem I complex.

P Reilly1, N Nelson

  • 1Roche Research Center, Roche Institute of Molecular Biology, 07110, Nutley, New Jersey, USA.

Photosynthesis Research
|January 16, 2014
PubMed
Summary
This summary is machine-generated.

Photosystem I, crucial for plant photosynthesis, facilitates electron transfer. This study details its protein subunits, pigments, and cofactors, exploring their assembly and function.

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Area of Science:

  • Plant molecular biology and biochemistry.
  • Photosynthesis and energy conversion.

Background:

  • Photosystem I (PSI) is a key protein complex in thylakoid membranes, essential for photosynthesis.
  • PSI catalyzes the photoreduction of ferredoxin, a critical step in electron transport.

Purpose of the Study:

  • To elucidate the molecular biology and biochemistry of the Photosystem I complex.
  • To discuss the structure-function relationships of individual PSI components.
  • To explore the assembly mechanisms of a functional Photosystem I complex.

Main Methods:

  • Review and synthesis of existing molecular biology and biochemistry data on Photosystem I.
  • Analysis of the structural and functional roles of PSI subunits, pigments, and cofactors.
  • Discussion of experimental evidence regarding PSI assembly pathways.

Main Results:

  • Photosystem I in higher plants comprises eight protein subunits, chlorophyll a, carotenoids, phylloquinone, and iron-sulfur clusters.
  • Each component plays a specific role in light capture, electron transfer, and complex stability.
  • Assembly involves intricate interactions between protein subunits and cofactors.

Conclusions:

  • Understanding Photosystem I structure, function, and assembly is vital for comprehending plant photosynthesis.
  • The complex's intricate composition and assembly highlight sophisticated biological mechanisms.
  • Further research can leverage this knowledge for applications in bioenergy and agriculture.