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#magnetotactic bacteria

2 public questions tagged with this topic.

Microbial Physiology

The function of Magnetosomes in bacteria is to:

Magnetosomes function as magnetoreceptor enabling magnetotaxis, not oxygen sensing or nutrient storage. Each magnetosome contains single domain crystal magnetite Fe3O4 35-120 nm with stable magnetic moment. Chain arrangement gives permanent magnetic dipole moment causing whole bacterium to behave as compass needle aligning with Earth's magnetic field inclination. This alignment simplifies navigation in stratified aquatic habitats where oxygen and sulfide gradients vertical. By swimming aligned with field lines, bacteria efficiently reach oxic anoxic interface where metabolism optimal microaero

Ref: Bazylinski & Frankel, Nat Rev Microbiol 2004, Magnetosomes allow orientation along magnetic field.

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Microbial Physiology

The cytoskeletal protein MamK is involved in:

Magnetotactic bacteria such as Magnetospirillum magneticum AMB-1 and gryphiswaldense biomineralize magnetic nanoparticles within lipid vesicles called magnetosomes to navigate chemical gradients in stratified water columns. Cytoskeletal protein MamK actin homolog is essential for organizing magnetosomes into linear chain maximizing dipole moment for efficient orientation. MamK polymerizes ATP dependently into filaments extending along cell long axis, forms scaffold similar MreB but dedicated. Adaptor protein MamJ interacts with magnetosome membrane proteins MamY and MamK linking vesicles to fi

Ref: Komeili et al., PNAS 2006, MamK involved in magnetosome positioning chain assembly.

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