title: Protein neighborhoods in the outer membrane of Salmonella typhimurium.
abstract: The organization of proteins in the outer membrane of Salmonella typhimurium was analyzed by cross-linking with cleavable reagents and symmetrical two-dimensional sodium dodecyl sulfate polyacrylamide gel electrophoresis. The major outer membrane proteins could be cross-linked to form multimeric complexes. The pore-forming 44 000, 36 000 and 34 000 dalton proteins were cross-linked to form dimers and trimers. Lipoprotein was cross-linked to 33 000 and 17 500 dalton proteins. In addition the 33 000, 24 000, 17 500 dalton proteins and the free form of lipoprotein were cross-linked to the peptidoglycan layer of the cell wall. The cross-linked complexes found were similar to those of analogous proteins in the outer membrane of Escherichia coli, thus suggesting a similar organization of outer membrane proteins in these species.
mesh_terms: D002473:Cell Wall / Q000032:analysis* / Q000648:ultrastructure; D003432:Cross-Linking Reagents; D004926:Escherichia coli / Q000032:analysis*; D008074:Lipoproteins / Q000032:analysis; D046911:Macromolecular Substances; D008565:Membrane Proteins / Q000032:analysis*; D008970:Molecular Weight; D012486:Salmonella typhimurium / Q000032:analysis*; D013045:Species Specificity
chemical_list: D003432:Cross-Linking Reagents; D008074:Lipoproteins; D046911:Macromolecular Substances; D008565:Membrane Proteins