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Interaction of Electric Fields with Membrane-Bound Polyionic Proteins

  • E. Neumann
  • K. Tsuji
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 64)

Abstract

Recent progress in electro-optic instrumentation has led to experimental results which give new insight into the dynamic behavior of membrane-bound polyionic macromolecules, such as bacteriorhodopsin in purple membranes. Electric impulses of high field intensity (2×105 to 3×106 Vm−1,1 to 20 ps duration) cause transient changes in the optical absorbance of suspended purple membranes of Halobacterium halobium. The electric dichroism at 1 mM NaC1 pH ≅ 6 and at 293 K is dependent on field strength, pulse duration and wavelength of the monitoring, plane-polarized light in the range 400 nm to 650 nm. The optically indicated processes are, however, independent of bacteriorhodopsin concentration, of ionic strength and of the intensity of the monitoring light. These data and the analysis of time course and steady state of the reduced dichroism suggest electric field sensitive, intramembraneous structural changes which involve restricted orientation changes of the chromophore. A theoretical analysis of restricted orientation is developed and applied to the electro-optic data. As a result it is found that the electric dichroism of purple membranes is associated with a large induced dipole moment up to 7×10−26 Cm (2.1×104 Debye) which develops in a cooperative manner; the electric permanent dipole moment which is involved amounts to 4.7×10−28 Cm (140 Debye).

Keywords

Orientation Factor Purple Membrane Permanent Dipole Moment Induce Dipole Moment Electric Permanent Dipole Moment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • E. Neumann
    • 1
  • K. Tsuji
    • 1
  1. 1.Max-Planck-Institut für BiochemieMartinsried/MünchenGermany

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