title: Isolation, cloning, and primary structure of a cationic 16-kDa outer membrane protein of Salmonella typhimurium.
abstract: By using acid-urea polyacrylamide gel electrophoresis, two cationic proteins were found in the isolated outer membranes of Salmonella typhimurium SH5014. Also, all the other enterobacterial strains studied (five additional strains of S. typhimurium, one strain of Salmonella minnesota, and three strains of Escherichia coli K12) had those proteins. The most abundant (OMB2) was purified in preparative acid-urea polyacrylamide gel electrophoresis and reversed-phase high pressure liquid chromatography (HPLC). It had a molecular mass of 16 kDa, a pI above 10.0, and was rich in arginine and lysine. 72% of the total amino acid sequence was determined by sequencing several HPLC-purified proteolytic fragments and 55 amino acids from the NH2 terminus. Furthermore, we isolated by molecular cloning the corresponding gene, named it ompH, and determined its nucleotide sequence. By combining protein and nucleotide sequence data, we determined the primary structure of the entire OmpH protein. It consists of 141 amino acids, possesses regions very rich in basic amino acids, and has a molecular mass of 15,862 kDa.
authors.affiliation: Department of Bacteriology and Immunology, University of Helsinki, Finland.
authors.forename: P
authors.initials: P
authors.lastname: Koski
authors.forename: M
authors.initials: M
authors.lastname: Rhen
authors.forename: J
authors.initials: J
authors.lastname: Kantele
authors.forename: M
authors.initials: M
authors.lastname: Vaara
mesh_terms: D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D002462:Cell Membrane / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D004926:Escherichia coli / Q000235:genetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011487:Protein Conformation; D012475:Salmonella / Q000235:genetics; D012486:Salmonella typhimurium / Q000032:analysis / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid
chemical_list: D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial