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Decrease in magnetic anisotropy of external segments of the retinal rods after a total photolysis
Biophysical Journal
|April 1, 1977
Abstract:
The magnetic anisotropy of a polymembrane cell, such as the external segment of the frog retinal rod, is defined as the difference between the axial magnetic susceptibility (chiar), chia - chir = deltachi of the segment. After the total photolysis of the rhodopsin in situ, deltachi decreases a significantly by 20%. This decrease in magnetic anisotrophy should involve a subtle molecular disorder, mostly due to an alteration of the rhodopsin molecule.
Insights
The magnetic anisotropy of frog retinal rod cells significantly decreases after rhodopsin photolysis. This change suggests molecular alterations within the rhodopsin molecule, impacting cell structure.
Area of Science:
- Biophysics
- Molecular Biology
- Neuroscience
Background:
- Polymembrane cells, like frog retinal rods, possess magnetic anisotropy.
- Magnetic anisotropy is quantified by the difference in axial magnetic susceptibility (Δχ).
Purpose of the Study:
- To investigate the effect of rhodopsin photolysis on the magnetic anisotropy of frog retinal rod cells.
- To understand the molecular basis of magnetic anisotropy in these cells.
Main Methods:
- Measurement of magnetic anisotropy (Δχ) in frog retinal rod external segments.
- Induction of total rhodopsin photolysis in situ.
Main Results:
- A significant decrease of 20% in magnetic anisotropy (Δχ) was observed after rhodopsin photolysis.
- The reduction in Δχ indicates a change in the molecular organization.
Conclusions:
- Rhodopsin plays a crucial role in maintaining the magnetic anisotropy of retinal rod cells.
- Photolysis-induced alterations in rhodopsin lead to molecular disorder and affect cell magnetic properties.