Journal ArticleDOI
Magnetosomes Are Cell Membrane Invaginations Organized by the Actin-Like Protein MamK
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TLDR
Using electron cryotomography, it seems that prokaryotes can use cytoskeletal filaments to position organelles within the cell.Abstract:
Magnetosomes are membranous bacterial organelles sharing many features of eukaryotic organelles. Using electron cryotomography, we found that magnetosomes are invaginations of the cell membrane flanked by a network of cytoskeletal filaments. The filaments appeared to be composed of MamK, a homolog of the bacterial actin-like protein MreB, which formed filaments in vivo. In a mamK deletion strain, the magnetosome-associated cytoskeleton was absent and individual magnetosomes were no longer organized into chains. Thus, it seems that prokaryotes can use cytoskeletal filaments to position organelles within the cell.read more
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References
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Journal ArticleDOI
Magnetosome formation in prokaryotes
TL;DR: Progress has been made in elucidating the molecular, biochemical, chemical and genetic bases of magnetosome formation and understanding how these unique intracellular organelles function.
Journal ArticleDOI
Control of Cell Shape in Bacteria: Helical, Actin-like Filaments in Bacillus subtilis
TL;DR: The distribution of the proteins in different species of bacteria, and the similarity of their sequence to eukaryotic actins, suggest that the MreB-like proteins have a cytoskeletal, actin-like role in bacterial cell morphogenesis.
Journal ArticleDOI
Prokaryotic origin of the actin cytoskeleton
TL;DR: It is demonstrated that the bacterial MreB protein assembles into filaments with a subunit repeat similar to that of F-actin—the physiological polymer of eukaryotic actin, demonstrating that M reB and actin are very similar in three dimensions.
Journal ArticleDOI
Linearly concatenated cyclobutane lipids form a dense bacterial membrane
Jaap S. Sinninghe Damsté,Marc Strous,W. Irene C. Rijpstra,Ellen C. Hopmans,Jan A. J. Geenevasen,Adri C. T. van Duin,Laura van Niftrik,Mike S. M. Jetten,Mike S. M. Jetten +8 more
TL;DR: The discovery of cyclobutane rings in the dominant membrane lipids of two anaerobic ammonium-oxidizing (anammox) bacteria is reported, illustrating that microbial membrane lipid structures are far more diverse than previously recognized.
Journal ArticleDOI
Characterization of the bacterial magnetosome membrane.
TL;DR: Intact magnetosomes of Aquaspirillum magnetotacticum were purified from broken cells by a magnetic separation technique and revealed the magnetite to be enclosed by a lipid bilayer admixed with proteins.