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Krios II-Titan Krios II at Diamond	Cryo-electron microscopy reveals two distinct type IV pili assembled by the same bacterium Alexander Neuhaus , Muniyandi Selvaraj , Ralf Salzer , Julian D. Langer , Kerstin Kruse , Lennart Kirchner , Kelly Sanders , Bertram Daum , Beate Averhoff , Vicki A. M. Gold Nature Communications 11 DOI: 10.1038/s41467-020-15650-w Diamond Proposal Number(s): [18258] Open Access Show Abstract ▼ Abstract: Type IV pili are flexible filaments on the surface of bacteria, consisting of a helical assembly of pilin proteins. They are involved in bacterial motility (twitching), surface adhesion, biofilm formation and DNA uptake (natural transformation). Here, we use cryo-electron microscopy and mass spectrometry to show that the bacterium Thermus thermophilus produces two forms of type IV pilus (‘wide’ and ‘narrow’), differing in structure and protein composition. Wide pili are composed of the major pilin PilA4, while narrow pili are composed of a so-far uncharacterized pilin which we name PilA5. Functional experiments indicate that PilA4 is required for natural transformation, while PilA5 is important for twitching motility.	May 2020

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