Identification and molecular characterization of a novel Salmonella enteritidis pathogenicity islet encoding an ABC transporter

URL:

Keywords:

Abstract:

Using a newly constructed minitransposon with a phoA reporter gene in a Salmonella enteritidis phoN mutant, we have identified an iron- and pH-inducible lipoprotein gene sfbA, which is a component of a novel ABC-type transporter system required for virulence. This gene is located on a 4 kb Salmonella-specific chromosomal segment, which constitutes a new pathogenicity islet. This islet encodes an outer membrane protein, OmpX, and contains the operon designated sfbABC (Salmonella ferric binding) encoding a putative periplasmic iron-binding lipoprotein SfbA, a nucleotide-binding ATPase SfbB and a cytoplasmic permease SfbC, as predicted by their characteristic signature sequences. Inactivation of the sfbA gene resulted in a mutant that is avirulent and induces protective immunity in BALB/c mice. The wild-type phenotype could be restored by in vivo complementation with the sfbABC operon. This novel transporter might be involved in iron uptake in Salmonella

Notes:

DA - 19991214 IS - 0950-382X (Print) LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't RN - 0 (ATP-Binding Cassette Transporters) RN - 0 (Bacterial Outer Membrane Proteins) RN - 0 (Bacterial Proteins) RN - 0 (Carrier Proteins) RN - 0 (Escherichia coli Proteins) RN - 0 (Iron-Binding Proteins) RN - 0 (Lipoproteins) RN - 0 (Periplasmic Binding Proteins) RN - 0 (RNA, Messenger) RN - 0 (SfbA protein, Salmonella) RN - 0 (Transferrin-Binding Proteins) RN - 134632-13-6 (OmpX protein, E coli) RN - EC 3.- (Hydrolases) SB - IM