This domain is found in a family of osmotic shock protection proteins (e.g. Swiss:P27291). It is also found in some Secretins and a group of potential haemolysins. Its likely function is attachment to phospholipid membranes [1].
The LysM (lysin motif) domain is about 40 residues long. It is found in a variety of enzymes involved in bacterial cell wall degradation [1]. This domain may have a general peptidoglycan binding function. The structure of this domain is known [2].