A β-cap on the FliPQR protein-export channel acts as the cap for initial flagellar rod assembly

Proceedings of the National Academy of Sciences, Volume 122, Issue 34, August 2025. <br/>SignificanceThe FliPQR complex forms a channel for export of flagellar structural subunits. It also acts as a template for FliE assembly within the Membrane-supramembrane-ring. However, despite previous studies of the FliPQR complex, it remains elusive …