title: Glycan recognition by the Bacteroidetes Sus-like systems.
abstract: The human gut Bacteroidetes employ multiple cell-envelope associated protein complexes, termed Sus-like systems, to capture and degrade glycans. Recently the structures of key glycan-binding Sus proteins, the surface located SusD proteins and the periplasmic sensor domains of the membrane spanning hybrid two-component systems (HTCS) controlling Sus expression, have been solved, providing insight into glycan acquisition and sensing in these symbionts. The α-helical SusD proteins bind glycans at the cell surface, and likely facilitate the shuttling of oligosaccharides to an associated TonB-dependent porin. The HTCS sensor domains adopt two distinct folds and the structures of these sensors with glycan suggest that signal transduction across the cytoplasmic membrane is different from classical two component systems.
authors: Institute for Cell and Molecular Biosciences, The Medical School, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, United Kingdom.
authors: David N
authors: DN
authors: Bolam
authors: Nicole M
authors: NM
authors: Koropatkin
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D041963:Bacteroidetes; D005110:Extracellular Space / Q000378:metabolism; D006801:Humans; D011134:Polysaccharides / Q000378:metabolism*; D011485:Protein Binding
chemical_list: D001426:Bacterial Proteins; D011134:Polysaccharides