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Magnetosomes Are Cell Membrane Invaginations Organized by the Actin-Like Protein MamK

Science  13 Jan 2006:
Vol. 311, Issue 5758, pp. 242-245
DOI: 10.1126/science.1123231

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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.

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