This family of TraC proteins is conserved in Proteobacteria. TraC is a cytoplasmic, peripheral membrane protein and is one of the proteins encoded by the F transfer region of the conjugative plasmid that is required for the assembly of F pilin into the mature F pilus structure. F pili are filamentous appendages that help establish the physical contact between donor and recipient cells involved in the conjugation process [1].

1: Localization of TraC, a protein involved in assembly of the F conjugative pilus. Schandel KA, Muller MM, Webster RE; J Bacteriol. 1992;174:3800-3806. PMID:1350587