title: Conserved structural and regulatory regions in the Salmonella typhimurium btuB gene for the outer membrane vitamin B12 transport protein.
abstract: The Salmonella typhimurium btuB gene encodes an outer membrane protein that is necessary for the transport of vitamin B12 and the uptake of the E colicins and bacteriophage BF23. The sequence of this gene showed 87% identity of the deduced polypeptide to its Escherichia coli homolog, and its product was found to function in transport as effectively in cells of E. coli as did the native protein. The extensive sequence conservation within the first 300 transcribed nucleotides, which include the leader and early part of the coding sequence, supports the proposed role of this region in the regulation of btuB gene expression.
authors.affiliation: Department of Microbiology, School of Medicine, University of Virginia, Charlottesville 22908.
authors.forename: B Y
authors.initials: BY
authors.lastname: Wei
authors.forename: C
authors.initials: C
authors.lastname: Bradbeer
authors.forename: R J
authors.initials: RJ
authors.lastname: Kadner
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000235:genetics*; D001483:Base Sequence / Q000235:genetics; D001693:Biological Transport, Active / Q000502:physiology; D004269:DNA, Bacterial / Q000235:genetics*; D004926:Escherichia coli / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial / Q000235:genetics*; D066298:In Vitro Techniques; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics; D012486:Salmonella typhimurium / Q000235:genetics* / Q000378:metabolism; D014805:Vitamin B 12 / Q000493:pharmacokinetics*
chemical_list: D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial; D014805:Vitamin B 12