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The recently elucidated archaeal flagellum, or archaellum, is analogous—but not homologous—to the bacterial one. In addition to no sequence similarity being detected between the genes of the two systems, the archaeal flagellum appears to grow at the base rather than the tip, and is about 15 nanometers (nm) in diameter rather than 20.
The archaellum (pl.: archaella; formerly archaeal flagellum) is a unique structure on the cell surface of many archaea that allows for swimming motility.The archaellum consists of a rigid helical filament that is attached to the cell membrane by a molecular motor.
[16] [17] [18] They provide two of several kinds of bacterial motility. [19] [20] Archaeal flagella are called archaella, and function in much the same way as bacterial flagella. Structurally the archaellum is superficially similar to a bacterial flagellum, but it differs in many details and is considered non-homologous. [21] [15]
The bacterial flagellum shares a common ancestor with the type III secretion system, [125] [126] while archaeal flagella appear to have evolved from bacterial type IV pili. [127] In contrast with the bacterial flagellum, which is hollow and assembled by subunits moving up the central pore to the tip of the flagella, archaeal flagella are ...
Aiming to emphasize the distinction between the bacterial flagella and the eukaryotic cilia and flagella, some authors attempted to replace the name of these two eukaryotic structures with "undulipodia" (e.g., all papers by Margulis since the 1970s) [61] or "cilia" for both (e.g., Hülsmann, 1992; [62] Adl et al., 2012; [63] most papers of ...
[117] [118] [119] They provide two of several kinds of bacterial motility. [120] [121] Archaeal flagella are called archaella, and function in much the same way as bacterial flagella. Structurally the archaellum is superficially similar to a bacterial flagellum, but it differs in many details and is considered non-homologous. [122] [116]
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