S-layer protein. The S-layer is a paracrystalline mono-layered assembly of proteins which coat the surface of the cell. Asn-455 is glycosylated by a pentasaccharide comprising a hexose, 2 hexuronic acids, a methyl ester of a hexuronic acid and a final hexose. The complete pentasaccharide is first assembled on dolichol phosphate and then transferred the glycan to the target Asn. Cleaved by the archaeosortase ArtA at the C-terminus, with removal of a short hydrophobic segment. Lipidation. Belongs to the halobacterial S-layer protein family. Extended N-terminus.