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Related Concept Videos

Channel Rhodopsins01:11

Channel Rhodopsins

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.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...

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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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Light-driven release from polymeric microcapsules functionalized with bacteriorhodopsin.

Svetlana Erokhina1, Lucia Benassi, Paolo Bianchini

  • 1Department of Biochemistry and Molecular Biology, University of Parma, Viale Usberti 23 A, 43100 Parma, Italy.

Journal of the American Chemical Society
|June 27, 2009
PubMed
Summary
This summary is machine-generated.

Bacteriorhodopsin in polymeric capsules controls pore opening with light, enabling pH-triggered release of encapsulated dyes. This demonstrates a novel light-responsive drug delivery system.

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Area of Science:

  • Biomaterials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Polymeric capsules are widely investigated for drug delivery.
  • Controlling the release of encapsulated substances remains a challenge.
  • Bacteriorhodopsin is a light-activated proton pump with potential for responsive materials.

Purpose of the Study:

  • To incorporate bacteriorhodopsin into polymeric capsule shells.
  • To investigate light-induced changes in capsule properties.
  • To demonstrate controlled release of encapsulated molecules.

Main Methods:

  • Incorporation of bacteriorhodopsin into the shell of polymeric capsules.
  • Scanning electron microscopy (SEM) to observe light-driven changes in intercapsule volume and pore opening.
  • Confocal fluorescence microscopy to monitor the release of encapsulated dye molecules.

Main Results:

  • Successful incorporation of bacteriorhodopsin into polymeric capsule shells.
  • Demonstration of light-induced pH variations and successive pore opening in the capsules via SEM.
  • Observation of controlled release of encapsulated dye molecules using confocal fluorescence microscopy.

Conclusions:

  • Bacteriorhodopsin-functionalized polymeric capsules exhibit light-responsive behavior.
  • The system allows for controlled pore opening and release of encapsulated contents.
  • This offers a promising platform for light-controlled drug delivery systems.