CsgG is an outer membrane-located lipoprotein that is highly resistant to protease digestion. During curli assembly, an adhesive surface fibre, CsgG is required to maintain the stability of CsgA and CsgB [1].

1: Availability of the fibre subunit CsgA and the nucleator protein CsgB during assembly of fibronectin-binding curli is limited by the intracellular concentration of the novel lipoprotein CsgG. Loferer H, Hammar M, Normark S; Mol Microbiol 1997;26:11-23. PMID:9383186