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Heterogeneity based on bending of purple membrane containing bacteriorhodopsin
Author(s) -
Mostafa Hamdy I.A
Publication year - 2004
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2004.06.066
Subject(s) - bacteriorhodopsin , rotational diffusion , light intensity , dipole , linearity , chemistry , dielectric , membrane , materials science , molecular physics , chemical physics , analytical chemistry (journal) , optics , physics , optoelectronics , biochemistry , organic chemistry , chromatography , anisotropy , quantum mechanics
The first and second derivatives of dielectric spectra have evidenced the existence of two interacting states of purple membrane (PM) that respond differently to the intensity of illuminating light providing, this way, underlying consequences to the heterogeneous behavior of bacteriorhodopsin (bR). It is of particular interest to note that the rotational diffusion coefficient of PM has exhibited non‐linearity versus light intensity. The explored non‐linearity in electrical properties beers, thereby, on changes in PM size. The non‐linear variations in PM bending might initiate, in consequence, variations in the dipole moment (permanent and induced) and dc‐conductivity of PM patches. Proposal based on PM bending has been introduced to correlate the light intensity effect to the PM lipid environment. Modulation of the global structure of PM and, in turn, its electrical properties by an external perturbation (e.g., light) could be of interest in biotechnological applications based on optoelectronic properties of bR.