Magnetosomes are cell membrane invaginations organized by the actin-like protein MamK |
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| Authors: | Komeili Arash Li Zhuo Newman Dianne K Jensen Grant J |
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| Institution: | Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. komeili@nature.berkeley.edu |
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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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