Analysis of the membrane-binding domain of penicillin-binding protein 5 of Escherichia coli |
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Authors: | M. E. Jackson J. M. Pratt |
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Affiliation: | Department of Biochemistry, University of Liverpool, UK. |
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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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