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  • Title: Analysis of the membrane-binding domain of penicillin-binding protein 5 of Escherichia coli.
    Author: Jackson ME, Pratt JM.
    Journal: Mol Microbiol; 1988 Sep; 2(5):563-8. PubMed ID: 3054422.
    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.
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