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Related Experiment Videos

Buffer-induced changes of purple membrane surface electric properties: an electro-optical study.

Tuparev1, Petkanchin, Taneva

  • 1Institute of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev Bl. 21, 1113, Sofia, Bulgaria

Colloids and Surfaces. B, Biointerfaces
|November 23, 2000
PubMed
Summary

Buffer molecules alter purple membrane charge and dipole moments. Different buffer types interact uniquely with membrane surfaces, influencing electric properties and charge displacement currents.

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NOTE

Journal of colloid and interface science·1997

Area of Science:

  • Biophysics
  • Membrane Biophysics
  • Biochemistry

Background:

  • Purple membranes contain bacteriorhodopsin (bR), a light-driven proton pump.
  • The electric dipole moment and surface charge of membranes are crucial for their function.
  • Buffer solutions can influence membrane properties through interactions with surface charges.

Purpose of the Study:

  • To investigate how different buffer molecules affect the electric dipole moments and electrokinetic charge of purple membranes.
  • To understand the differential interaction of buffer molecules with purple membrane surfaces.

Main Methods:

  • Electric light scattering was used to measure electric dipole moments.
  • Microelectrophoresis was employed to determine electrophoretic mobility and surface charge.

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  • Analysis of light-induced charge displacement currents in the presence of different buffers.

    • Main Results:

    • 'P'-type and 'N'-type buffer molecules induced opposing changes in the permanent dipole moment and electrophoretic mobility of purple membranes.
    • 'P'-type and 'N'-type buffers introduced distinct 'positive' and 'negative' components to the bR light-induced charge displacement current.
    • Differential distribution of buffer molecules on the cytoplasmic and extracellular membrane surfaces was observed, dependent on their protonation state and interaction.

    Conclusions:

    • Buffer molecules significantly alter the electric properties of purple membranes.
    • The interaction of buffer molecules with membrane surfaces is dependent on their chemical nature and protonation state.
    • Differential surface interactions of buffer molecules explain their distinct effects on membrane electrokinetics and charge displacement.