Table 1

Nomenclature for related filament systems in Gram-negative and Gram-positive bacteria

Protein categoryProtein(s) in system
Gram-negative bacterial systemsGram-positive T4Pd
T4PaT2SSbTAD pilic
Major pilins/pseudopilinsPilAGspGFlpPilA
Minor pilins/pseudopilinsFimU, PilV, PilW, PilX, PilEGspH, GspI, GspJ, GspKTadE, TadF, TadGVarious proteins
Assembly ATPasePilBGspETadAPilB
Inner membrane core proteinPilCGspFTadB, TadCPilC
Prepilin peptidasePilDGspOTadVPilD
Outer membrane secretinPilQGspDRcpA
Retraction ATPasePilT, PilUPilT
Inner membrane accessory proteinPilM, PilN, PilOGspL, GspMTadG, TadZPilM, PilN, PilO
  • a Pseudomonas aeruginosa nomenclature.

  • b General secretion pathway nomenclature (170).

  • c Pseudomonas aeruginosa nomenclature.

  • d Clostridium perfringens nomenclature.