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In response to a variety of environmental cues, prokaryotes can switch between a motile and a sessile, biofilm‐forming mode of growth. The regulatory mechanisms and signaling pathways underlying this switch are largely unknown in archaea but involve small winged helix‐turn‐helix DNA‐binding proteins of the archaea‐specific Lrs14 family. Here, we study the Lrs14 member AbfR1 of Sulfolobus acidocaldarius...
The motor of the membrane‐anchored archaeal motility structure, the archaellum, contains FlaX, FlaI and FlaH. FlaX forms a 30 nm ring structure that acts as a scaffold protein and was shown to interact with the bifunctional ATPase FlaI and FlaH. However, the structure and function of FlaH has been enigmatic. Here we present structural and functional analyses of isolated FlaH and archaellum motor subcomplexes...
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