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Magnetosomes Are Cell Membrane Invaginations Organized by the Actin-Like Protein MamK
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Magnetosomes Are Cell Membrane Invaginations Organized by the Actin-Like Protein MamK
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Journal Article
Magnetosomes Are Cell Membrane Invaginations Organized by the Actin-Like Protein MamK
2006
Overview
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.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Bacteria
/ Bacterial Proteins - chemistry
/ Bacterial Proteins - genetics
/ Bacterial Proteins - physiology
/ Biological and medical sciences
/ Cell Membrane Structures - chemistry
/ Cell Membrane Structures - physiology
/ Cell Membrane Structures - ultrastructure
/ Cells
/ Crystals
/ Fundamental and applied biological sciences. Psychology
/ Magnetospirillum - physiology
/ Magnetospirillum - ultrastructure
/ Morphology, structure, chemical composition
/ Mutation
/ Proteins
