Abstract
Swimming archaea are propelled by a filamentous structure called the archaellum. The first step for the structural characterization of this filament is its isolation. Here we provide various methods that allow for the isolation of archaella filaments from well-studied archaeal model organisms. Archaella filaments have been successfully extracted from organisms belonging to different archaeal phyla, e.g., euryarchaeal methanogens such as Methanococcus voltae, and crenarchaeal hyperthermoacidophiles like Sulfolobus acidocaldarius. The filament isolation protocols that we provide in this chapter follow one of two strategies: either the filaments are sheared or extracted from whole cells by detergent extraction, prior to further final purification by centrifugation methods.
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