title: Characterization of a nucleotide-binding domain associated with neisserial iron transport.
abstract: The fbpABC operon in Neisseria gonorrhoeae encodes an ATP-binding cassette transporter required for iron uptake from the host ferric binding proteins. The gene for the nucleotide-binding domain (fbpC) expressed in Escherichia coli has intrinsic ATPase activity (0.5 mmol/min/mg) uncoupled from the iron transport process. The FbpC E164D mutant is found to have a 10-fold reduction in specific activity. FbpC is covalently modified by 8-azido-[gamma32P]ATP, indicating that FbpC is a functional ATPase that likely combines with FbpB to form a ferric iron transporter.
authors.affiliation: Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.
authors.forename: Gloria H Y
authors.initials: GH
authors.lastname: Lau
authors.forename: Ross T A
authors.initials: RT
authors.lastname: MacGillivray
authors.forename: Michael E P
authors.initials: ME
authors.lastname: Murphy
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000031:analogs & derivatives / Q000378:metabolism*; D001386:Azides / Q000378:metabolism; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D027682:Cation Transport Proteins / Q000737:chemistry / Q000378:metabolism*; D017136:Ion Transport; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009344:Neisseria gonorrhoeae / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D001386:Azides; D001426:Bacterial Proteins; D027682:Cation Transport Proteins; D011994:Recombinant Proteins; C017040:8-azidoadenosine 5'-triphosphate; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases