lantibiotic immunity ABC transporter permease (also called ABC-2 transporter permease) subunit and similar proteins
This subfamily contains lantibiotic ABC transporter permease subunits which are highly hydrophobic, integral membrane proteins, and part of the bacitracin ABC transport system that confers resistance to the Gram-positive bacteria in which this system operates, particularly to type-A lantibiotics. Lantibiotics are small peptides, produced by Gram-positive bacteria, which are ribosomally-synthesized as pre-peptides and act by disrupting membrane integrity. Genes encoding the lantibiotic ABC transporter subunits are highly organized in operons containing all the genes required for maturation, transport, immunity, and synthesis. For example, in Lactococcus lactis, the lantibiotic nisin is active against other Gram-positive bacteria via various modes of actions; however, its self-protection against the pore-forming nisin is mediated by the ABC transporter composed of NisF, NisE and NisG; the NisG permease subunit transports nisin to the surface and expels it from the membrane. This family includes mostly uncharacterized transport permease subunits that transport lantibiotics to the surface and expel them from the membrane.
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