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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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Measurement of proton release and uptake by analogs of bacteriorhodopsin.

H H Weetall1, A Druzhko, A R de Lera

  • 1Biotechnology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. howard.weetall@nist.gov

Bioelectrochemistry (Amsterdam, Netherlands)
|May 3, 2000
PubMed
Summary
This summary is machine-generated.

Researchers measured proton movement in bacteriorhodopsin (bR) analogs using electrochemistry. Proton release and uptake profiles differed significantly between analogs and native bR, offering new insights into bR proton transfer mechanisms.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Electrochemistry

Background:

  • Bacteriorhodopsin (bR) is a light-driven proton pump crucial for cellular energy generation.
  • Understanding the proton transfer mechanism in bR is key to deciphering its function.
  • Mutations and analogs allow for probing specific functional sites within bR.

Purpose of the Study:

  • To quantify and compare proton release and uptake kinetics in various bacteriorhodopsin analogs.
  • To investigate the impact of structural modifications (4-keto and 9-demethylretinal analogs) on bR proton transfer.
  • To elucidate the relationship between pH and proton transfer dynamics in native and mutant bR.

Main Methods:

  • Utilized a sensitive electrochemical technique to measure proton release and uptake.
  • Immobilized membrane patches containing bacteriorhodopsin (bR) on a tin oxide electrode.
  • Generated current transients proportional to the rate of pH change at the electrode surface.

Main Results:

  • Successfully measured proton release and uptake for wild-type (WT) bR, D96N and D85N mutants, and their 9-demethylretinal analogs.
  • Observed distinct proton release profiles across different pH values for the bR analogs compared to native proteins.
  • Electrochemical measurements provided quantitative data on the kinetics of proton transfer.

Conclusions:

  • Structural modifications in bacteriorhodopsin analogs significantly alter proton transfer pathways and kinetics.
  • The electrochemical technique offers a sensitive method for studying proton dynamics in membrane proteins.
  • Findings contribute to a deeper understanding of the molecular mechanisms underlying bacteriorhodopsin function.