This domain family is found in a group of bacterial uncharacterised sequences from mobile gene cassettes, including Integron cassette protein from Vibrio cholerae (M1E1E6). This protein forms a dimer in which each protomer adopts a two-layered alpha+beta fold with an anti-parallel beta-sheet of five strands which curves around a pair of antiparallel helices [1]. Its specific function is unknown.

1: Integron gene cassettes: a repository of novel protein folds with distinct interaction sites. Sureshan V, Deshpande CN, Boucher Y, Koenig JE, Stokes HW, Harrop SJ, Curmi PM, Mabbutt BC; PLoS One. 2013;8:e52934. PMID:23349695