Novel quadruple helical assembly of a Type V pilin in Porphyromonas gingivalis
This study presents the high-resolution atomic structure of the novel Type V pilin Ffp1 from *Porphyromonas gingivalis*, revealing a unique quadruple helical assembly and demonstrating its critical role in outer membrane vesicle production and polymicrobial biofilm formation with *Treponema denticola*.