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Flagellum is a lash-like cellular appendage found in many single-celled living organisms. The flagellin protofilaments contain 11-helix dual turn structure in a single flagellum. Each flagellin consists of four sub-domains - two inner domains (D0, D1) and two outer domains (D2, D3). While inner domains predominantly consist of α-helices, the outer domains are primarily beta sheets with D3. In flagellum,...
Magnetotactic bacteria (MTB), discovered in early 1970s contain single-domain crystals of magnetite (Fe3O4) or greigite (Fe3S4) called magnetosomes ranging from 35 to 120 nm in size. These crystals tend to form a chain like structure from the proximal to the distal pole along the long axis of the cell and align through an acidic protein mamJ to the bacterial cytoskeleton filament made out of actin-like...
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