This domain family is found in bacteria, archaea and eukaryotes, and is approximately 30 amino acids in length. The family is found in association with Pfam:PF00005. There is a conserved AYLG sequence motif. This family is the C terminal of an ATP dependent branched-chain amino acid transporter [1]. This domain is essential for LPS transport, through critical interactions with Walker A and switch helix domains [2].

1: Nucleotide sequence and genetic characterization reveal six essential genes for the LIV-I and LS transport systems of Escherichia coli. Adams MD, Wagner LM, Graddis TJ, Landick R, Antonucci TK, Gibson AL, Oxender DL; J Biol Chem 1990;265:11436-11443. PMID:2195019

2: Combining Mutations That Inhibit Two Distinct Steps of the ATP Hydrolysis Cycle Restores Wild-Type Function in the Lipopolysaccharide Transporter and Shows that ATP Binding Triggers Transport. Simpson BW, Pahil KS, Owens TW, Lundstedt EA, Davis RM, Kahne D, Ruiz N; mBio. 2019; [Epub ahead of print] PMID:31431556