title: Isolation and nucleotide sequence of the gene encoding cytotoxic necrotizing factor 1 of Escherichia coli.
abstract: Cytotoxic necrotizing factors (CNFs) are dermonecrotic protein toxins produced by human and animal clinical isolates of Escherichia coli. In this study, the CNF1 determinant was isolated and sequenced, showing that expression of biologically active toxin is governed by a unique open reading frame encoding a protein of 1,014 amino acids with a predicted molecular mass of 113.7 kDa. Nucleotide and protein data base searches showed significant homology between CNF1 and the dermonecrotic toxin of Pasteurella multocida. In particular, the two toxins were found to share a hydrophobic region of about 220 amino acids which is a potential membrane-spanning domain.
authors.affiliation: Laboratorio di Ultrastrutture, Istituto Superiore di Sanità, Rome, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Falbo
authors.forename: T
authors.initials: T
authors.lastname: Pace
authors.forename: L
authors.initials: L
authors.lastname: Picci
authors.forename: E
authors.initials: E
authors.lastname: Pizzi
authors.forename: A
authors.initials: A
authors.lastname: Caprioli
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D001427:Bacterial Toxins / Q000737:chemistry / Q000235:genetics*; D001483:Base Sequence; D003603:Cytotoxins / Q000737:chemistry / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics* / Q000472:pathogenicity; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid
chemical_list: D001426:Bacterial Proteins; D001427:Bacterial Toxins; D003603:Cytotoxins; D029968:Escherichia coli Proteins; C062258:Pasteurella multocida toxin; C060296:cytotoxic necrotizing factor type 1