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New magnet-sensitive structures in bacterial and archaeal cells
M Vainshtein1, N Suzina, E Kudryashova
1Institute of Biochemistry and Physiology of Microorganisms, Russ Acad Sc, Pushchino, Moscow Region. vain@ibpm.serpukhov.su
Biology of the Cell
|May 10, 2002
Summary
Magnet-sensitive inclusions (MsI) were found in Bacteria and Archaea. These magnetic structures, composed of iron, cobalt, or chromium, are present in various prokaryotic groups.
Area of Science:
- Microbiology
- Biophysics
- Biochemistry
Background:
- Prokaryotes exhibit diverse intracellular structures.
- Magnetism in biological systems is an area of active research.
Purpose of the Study:
- To investigate the distribution and characteristics of magnet-sensitive inclusions (MsI) in prokaryotes.
- To determine the composition and organization of MsI within cells.
Main Methods:
- Electron microscopy for visualizing MsI structure.
- X-ray analysis for elemental composition.
- Magnetic attraction tests on cell suspensions and isolated MsI.
Main Results:
- MsI were identified across Bacteria and Archaea, including 7 bacterial orders.
- MsI appear as amorphous globules with distinct electron-transparent centers and electron-dense matrices.
- Magnetic properties were confirmed by direct attraction to magnets.
- Iron enrichment in MsI was observed in iron-grown cells; cobalt or chromium enrichment occurred when these elements were supplied.
Conclusions:
- Magnet-sensitive inclusions are widespread among prokaryotes.
- The composition of MsI can be influenced by environmental metal availability, suggesting a role in metal homeostasis or detoxification.