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. 2008 Jul 8;10(12):2377–2386. doi: 10.1111/j.1462-5822.2008.01187.x

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© 2008 Blackwell Publishing Ltd

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Fig. 2 — Model of the VirB/VirD4 type IV secretion machinery of Agrobacterium tumefaciens. The T4SS of A. tumefaciens is a multicomponent cell-envelope spanning structure that consists of 11 VirB proteins VirB1–VirB11 and VirD4. Colour code: yellow, nucleoside triphosphatases that provide energy for the transfer; blue, components of the transmembrane channel; red, pilus-forming components; green, lytic transglycosylase responsible for the degradation of the murein (peptidoglycan) layer at the site of assembly.