They are Chaperone/usher (CU) pili, and have an N-terminal extension (Nte) of around 10-20 amino acids. Salmonella Saf pili, which are assembled by FGl chaperones. The structure has been well conserved, as they contain a set of alternating hydrophobic residues that form an essential part of the subunit-subunit interaction.

Mechanism

The mechanism for the assembly reaction is termed

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