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Related Concept Videos

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.
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...
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Photosystem II01:22

Photosystem II

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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.
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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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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The Photochemical Reaction Center01:29

The Photochemical Reaction Center

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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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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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Related Experiment Video

Updated: Dec 1, 2025

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
07:10

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

Published on: February 3, 2023

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Modelling photosystem I as a complex interacting network.

D Montepietra1,2, M Bellingeri3,4, A M Ross4

  • 1Dipartimento di Fisica, Università di Modena e Reggio Emilia, via Campi, 213/a, 41125 Modena, Italy.

Journal of the Royal Society, Interface
|November 10, 2020
PubMed
Summary
This summary is machine-generated.

Photosystem I (PSI) in pea plants exhibits robust excitation energy transfer (EET) resilience. Even when weak links are removed, the network maintains energy pathways, highlighting chlorophyll a

Keywords:
biological networkcomplex networknetwork attacknetwork robustnessphotosynthetic networkphotosystem I

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Area of Science:

  • Photosynthesis research
  • Plant biology
  • Biophysics

Background:

  • Photosystem I (PSI) is crucial for light-dependent reactions in plants.
  • Understanding excitation energy transfer (EET) within PSI is key to optimizing photosynthesis.

Purpose of the Study:

  • To model and analyze the excitation energy transfer (EET) network of Photosystem I (PSI) in *Pisum sativum* (pea plant).
  • To assess the resilience and efficiency of the PSI network using network theory indicators.
  • To identify the functional roles of different chromophores within the PSI network.

Main Methods:

  • Modeling PSI as a complex network of interacting chromophores.
  • Calculating energy transfer link magnitudes using Förster resonant energy transfer (FRET).
  • Employing network efficiency (Eff), largest connected component (LCC), and a novel measure, connected nodes to P700 (CN), to assess network integrity.

Main Results:

  • The PSI network demonstrates significant resilience, maintaining EET pathway integrity (LCC and CN) even after removing weak links.
  • Network efficiency (Eff) decreases with weak link removal, but the system is only impaired when most links are disrupted.
  • Chlorophyll a (CLA) molecules are identified as central nodes critical for high EET efficiency, as their removal drastically reduces Eff.

Conclusions:

  • The PSI network is a highly resilient system with a broad functional feasibility window.
  • Chlorophyll a plays a pivotal role in the overall excitation energy transfer efficiency of PSI.
  • Future research can compare PSI efficiency across plant species and explore artificial photosynthesis applications.