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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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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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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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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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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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Related Experiment Video

Updated: Apr 16, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

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3D proton transfer augments bio-photocurrent generation.

Siyuan Rao1, Zhibin Guo, Dawei Liang

  • 1Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing, 100191, PR China.

Advanced Materials (Deerfield Beach, Fla.)
|March 20, 2015
PubMed
Summary

Researchers created a novel biohybrid nanocomposite that significantly boosts photocurrent. This enhancement stems from an improved protein photocycle and proton conductivity, enabled by a unique 3D proton-transfer framework.

Keywords:
bioelectronicsnano-biotechnologyphotoinduced proton pumpproton transfer

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Materials Science

Background:

  • Proteorhodopsin is a light-driven proton pump.
  • Nanoparticles can enhance material properties.
  • Biohybrid materials combine biological and synthetic components.

Purpose of the Study:

  • To enhance photocurrent in a biohybrid nanocomposite.
  • To investigate the role of proteorhodopsin and nanoparticles in photo-electric performance.

Main Methods:

  • Fabrication of a biohybrid nanocomposite using nanovesicle reconstituted proteorhodopsin and potassium phosphotungstate nanoparticles.
  • Characterization of the nanocomposite's photo-electric properties.
  • Analysis of the protein photocycle and proton conductivity.

Main Results:

  • Significant enhancement of photocurrent was observed.
  • An accelerated protein photocycle was detected.
  • Elevated proton conductivity was measured.
  • A 3D proton-transfer framework was identified as the key structural element.

Conclusions:

  • The biohybrid nanocomposite demonstrates improved photo-electric performance.
  • The 3D proton-transfer framework facilitates enhanced proton transfer, leading to better photocurrent.
  • This work offers a promising approach for developing advanced photo-electric devices.