title: Analysis of the membrane-binding domain of penicillin-binding protein 5 of Escherichia coli.
abstract: Internal deletions close to the C-terminus of the Escherichia coli penicillin binding protein 5 (PBP5, DacA) have defined the C-terminal 18 residues of the protein as essential for membrane binding. This C-terminal sequence is capable of forming a strongly amphiphilic alpha-helix. In this paper we show that the PBP5 amphiphilic helix is able to anchor the periplasmic TEM-beta-lactamase to the inner membrane. In addition, we have demonstrated that mature PBP5 (lacking the N-terminal signal sequence) possesses the ability to bind to the membrane from a soluble form of the protein, showing that translocation across the membrane is unnecessary for anchoring to be established.
authors.affiliation: Department of Biochemistry, University of Liverpool, UK.
authors.forename: M E
authors.initials: ME
authors.lastname: Jackson
authors.forename: J M
authors.initials: JM
authors.lastname: Pratt
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D001692:Biological Transport; D015153:Blotting, Western; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D006602:Hexosyltransferases; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D002267:Muramoylpentapeptide Carboxypeptidase / Q000235:genetics / Q000378:metabolism*; D009154:Mutation; D046915:Penicillin-Binding Proteins; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism*; D010458:Peptidyl Transferases; D010957:Plasmids; D021382:Protein Sorting Signals / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D001618:beta-Lactamases / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D008565:Membrane Proteins; D046915:Penicillin-Binding Proteins; D010446:Peptide Fragments; D021382:Protein Sorting Signals; D011993:Recombinant Fusion Proteins; D010458:Peptidyl Transferases; D006602:Hexosyltransferases; D002267:Muramoylpentapeptide Carboxypeptidase; D001618:beta-Lactamases