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Related Concept Videos

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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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.
Functioning of Photosystems
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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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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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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

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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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Spectrophotometric Determination of Phycobiliprotein Content in Cyanobacterium Synechocystis
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Concentration-based self-assembly of phycocyanin.

Ido Eisenberg1,2, Dvir Harris3, Yael Levi-Kalisman2,4

  • 1Applied Physics Department, The Hebrew University of Jerusalem, Givat-Ram, Jerusalem, 9190401, Israel.

Photosynthesis Research
|June 4, 2017
PubMed
Summary

Cyanobacteria light-harvesting complexes, like phycocyanin (PC), adapt to changing environments by altering their structure. This study reveals how PC self-assembly in concentrated solutions mimics in vivo conditions, aiding adaptation.

Keywords:
Native mass spectrometryOligomerizationPhycocyaninSAXSTEM

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Area of Science:

  • Photosynthesis research
  • Biophysics of light-harvesting complexes
  • Cyanobacterial adaptation mechanisms

Background:

  • Cyanobacteria possess adaptable light-harvesting complexes crucial for photosynthesis.
  • In vivo studies of these complexes are challenging due to cellular complexity and high concentrations.
  • In vitro replication of in vivo conditions, particularly high optical density, is difficult.

Purpose of the Study:

  • To map the self-assembly pathways of cyanobacterial antenna proteins.
  • To mimic in vivo concentrated conditions using phycocyanin (PC) solutions.
  • To understand how PC oligomeric states change with concentration.

Main Methods:

  • Isolation of phycocyanin (PC) from the thermophilic cyanobacterium Thermosynechococcus vulcanus.
  • Preparation of highly concentrated PC solutions to mimic in vivo conditions.
  • Measurement of PC oligomeric states (hexamer, trimer, monomer) using various methods.

Main Results:

  • Demonstrated that phycocyanin (PC) oligomeric state is concentration-dependent.
  • Observed shifts in oligomeric states (hexamer, trimer, monomer) with increasing PC concentration.
  • Successfully mimicked in vivo-like concentrated conditions in vitro.

Conclusions:

  • The concentration-dependent oligomerization of PC is a key mechanism for light-harvesting adaptation.
  • This self-assembly pathway allows photosynthetic organisms to adjust their light-harvesting capacity.
  • Findings provide insights into how cyanobacteria cope with fluctuating environmental conditions.