This small family of proteins found in Clostridiales is functionally uncharacterized. Proteins in this family are around 130 amino acids in length. Based on NMR structure 2MCA, it forms a beta-sandwich structure consisting of two 4-stranded antiparallel b-strands. The structure is very similar to glutamine glutamyltransferases (1l9n) and peptide transporters (5a9h).