DotG/IcmE is a homolog of VirB10 which forms part of core complex in Type IV secretion system
This family contains DotG/IcmE (VirB10 homolog) and a component of the type IV secretion system (T4SS), and similar proteins. The Dot/Icm system is a T4SS found in the pathogens Legionella and Coxiella and the conjugative apparatus of IncI plasmids; T4SS is employed by pathogenic bacteria to export virulence DNAs and/or proteins directly from the bacterial cytoplasm into the host cell. Similar to T4SS VirB/D components, the Legionella Dot/Icm secretion apparatus contains a critical five-protein sub-assembly that forms the membrane-spanning 'core-complex' (CC), around which all other components assemble. This transmembrane connection is mediated by protein dimer pairs consisting of two inner membrane proteins, DotF and DotG, each independently associating with DotH/DotC/DotD in the outer membrane.
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