title: Archaeal surface layer proteins contain beta propeller, PKD, and beta helix domains and are related to metazoan cell surface proteins.
abstract: The surface layer of archaeobacteria protects cells from extreme environments and, in Methanosarcina, may regulate cell adhesion. We identify three domain types that account for the complete architecture of numerous Methanosarcina surface layer proteins (SLPs). We solve the crystal structure for two of these domains, which correspond to the two N-terminal domains of an M. mazei SLP. One domain displays a unique, highly symmetrical, seven-bladed beta propeller fold, and the other belongs to the polycystic kidney disease (PKD) superfamily fold. The third domain is predicted to adopt a beta helix fold. These domains have homologs in metazoan cell surface proteins, suggesting remarkable relationships between domains in archaeal SLPs and metazoan cell surface proteins.
authors.affiliation: Center for Blood Research and Department of Pathology, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Hua
authors.initials: H
authors.lastname: Jing
authors.forename: Junichi
authors.initials: J
authors.lastname: Takagi
authors.forename: Jin-huan
authors.initials: JH
authors.lastname: Liu
authors.forename: Sara
authors.initials: S
authors.lastname: Lindgren
authors.forename: Rong-guang
authors.initials: RG
authors.lastname: Zhang
authors.forename: A
authors.initials: A
authors.lastname: Joachimiak
authors.forename: Jia-huai
authors.initials: JH
authors.lastname: Wang
authors.forename: Timothy A
authors.initials: TA
authors.lastname: Springer
mesh_terms: D000595:Amino Acid Sequence; D019843:Archaeal Proteins / Q000737:chemistry*; D008565:Membrane Proteins / Q000737:chemistry*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D017386:Sequence Homology, Amino Acid
chemical_list: D019843:Archaeal Proteins; D008565:Membrane Proteins