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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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Light-controlled spin filtering in bacteriorhodopsin.

Hila Einati1, Debabrata Mishra, Noga Friedman

  • 1Department of Chemical Physics and ‡Department of Organic Chemistry, Weizmann Institute , Rehovot 76100, Israel.

Nano Letters
|January 27, 2015
PubMed
Summary
This summary is machine-generated.

Light can control electron spin filtering in proteins. Researchers found that illuminating bacteriorhodopsin (bR) with light reduced spin filtering in a mutant form, offering insights into protein structure and spin selectivity.

Keywords:
Spin filteringbacteriorhodopsinelectrochemistrylight-induced effects

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Spintronics

Background:

  • Electron spin's role in chemistry and biology is gaining attention due to potential electromagnetic field effects and spintronics applications.
  • The chiral-induced spin selectivity effect demonstrates spin filtering during electron transmission through organic molecules.

Purpose of the Study:

  • To investigate the control of electron spin filtering by light in purple membranes containing bacteriorhodopsin (bR).
  • To explore the relationship between protein structure and spin filtering properties.

Main Methods:

  • Spin-dependent electrochemical cyclic voltammetry (CV) and chronoamperometric measurements were used.
  • Purple membranes with wild-type bR and its D96N mutant were deposited on nickel substrates.
  • Samples were illuminated with 532 nm light to observe changes in spin filtering.

Main Results:

  • High spin-dependent electron transmission was observed through both wild-type and mutant bR membranes.
  • Illumination with 532 nm light significantly reduced spin filtering in the D96N mutant.
  • Wild-type bR showed no significant change in spin filtering upon illumination.

Conclusions:

  • Light can modulate spin filtering in bacteriorhodopsin, particularly in the D96N mutant.
  • The study highlights the influence of protein structure on spin-dependent electron transport.
  • This research provides insights into the potential of light-controlled spintronic devices utilizing biological molecules.