This family consists of several related groups of proteins one of which is the LptC family. LptC is involved in lipopolysaccharide-assembly on the outer membrane of Gram-negative organisms. The lipopolysaccharide component of the outer bacterial membrane is transported form its source of origin to the outer membrane by a set of proteins constituting a transport machinery that is made up of LptA, LptB, LptC, LptD, LptE. LptC is located on the inner membrane side of the intermembrane space.

1: Functional analysis of the protein machinery required for transport of lipopolysaccharide to the outer membrane of Escherichia coli. Sperandeo P, Lau FK, Carpentieri A, De Castro C, Molinaro A, Deho G, Silhavy TJ, Polissi A; J Bacteriol. 2008;190:4460-4469. PMID:18424520