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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...
Type IV pili (T4P) are critical to virulence for Vibrio cholerae and other bacterial pathogens. Among their diverse functions, T4P mediate microcolony formation, which protects the bacteria from host defences and concentrates secreted toxins. The T4P of the two V. cholerae O1 disease biotypes, classical and El Tor, share 81% identity in their TcpA subunits, yet these filaments differ in their interaction...
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