9.B.461.  The ATP-driven Rotary Archaellum (ARA) Family 

Motile archaea swim by means of a molecular machine called the archaellum (Nuno de Sousa Machado et al. 2022). This structure consists of a filament attached to a membrane-embedded motor. The archaellum is found exclusively in members of the archaeal domain, but the core of its motor shares homology with the motor of type IV pili (T4P). Nuno de Sousa Machado et al. 2022 provided an overview of the different components of the archaellum machinery and hypothetical models to explain how rotary motion of the filament is powered by the archaellum motor.  The history or archaeal motility studies has been summarized (Jarrell et al. 2021).