The csg operons encode the curli-specific genes [52]. CsgA is the major curlin subunit and is secreted into the periplasmic space in an unstructured conformation via SecYEG [3]. CsgA is maintained as unstructured in the periplasmic space by the amyloid inhibitor, CsgC [13]. Soluble CsgA is secreted to the outer membrane via the nonameric CsgG pore and nonameric CsgE adaptor complex [58,59,63]. CsgA assumes a β-sheet rich conformation upon interaction with the minor curlin subunit and nucleator protein, CsgB, which is tethered to CsgG via CsgF [11,56,60,62].