FIVAR domain. This domain is found in a wide variety of contexts, but mostly occurring in cell wall associated proteins. A lack of conserved catalytic residues suggests that it is a binding domain. From context, possible substrates are hyaluronate or fibronectin (personal obs: C Yeats). This is further evidenced by. Possibly the exact substrate is N-acetyl glucosamine. Finding it in the same protein as pfam05089 further supports this proposal. It is found in the C-terminal part of Bacillus sp. Gellan lyase, which is removed during maturation. Some of the proteins it is found in are involved in methicillin resistance. The name FIVAR derives from Found In Various Architectures.
SEC10/PgrA surface exclusion domain. This model describes a conserved domain found in surface proteins of a number of Firmutes. Many members have LPXTG C-terminal anchoring motifs and a substantial number have the KxYKxGKxW putative sorting signal at the N-terminus. The tetracycline resistance plasmid pCF10 in Enterococcus faecalis promotes conjugal plasmid transfer in response to sex pheromones, but PgrA/Sec10 encoded by that plasmid, a member of this family, specifically inhibits the ability of cells to receive homologous plasmids. The phenomenon is called surface exclusion.