S-layer protein. The S-layer is a paracrystalline mono-layered assembly of proteins which coat the surface of the cell. In H.hispanica, the S-layer contains two different glycoproteins, Slg1 and Slg2, which share highly similar amino acid sequences. N-glycosylated on Asn-306; this N-linked glycan is a branched trisaccharide containing 2-amino-6-sulfo-2,6-dideoxy-glucose (sulfoquinovosamine). 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.