title: Partial characterization of peptidoglycan-associated proteins of Legionella pneumophila.
abstract: The proteins associated with the peptidoglycan (PG) of Legionella pneumophila are resistant to proteolysis by trypsin, protease VI and proteinase K. These protease-resistant proteins are associated with the PG noncovalently and covalently. Analysis of cell walls and PG-protein complex by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions revealed one major protein (38.5K) and several minor Coomassie and silver staining components. The 38.5K protein seemed to be a major component which was co-purified with the PG. The cleavage of the PG-protein complex by 1 N NaOH treatment yielded PG free of proteins which was subjected to alkali hydrolysis. This association of PG and protease-resistant covalently-bound proteins may be an important structural and functional determinant of resistance to both environmental conditions and intracellular digestion of L. pneumophila by eukaryotic cells.
mesh_terms: D001426:Bacterial Proteins / Q000302:isolation & purification*; D002473:Cell Wall / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D006868:Hydrolysis; D007875:Legionella / Q000032:analysis*; D010457:Peptidoglycan / Q000302:isolation & purification*; D011485:Protein Binding
chemical_list: D001426:Bacterial Proteins; D010457:Peptidoglycan