Lookup NU author(s): Dr Qi Hong,
Dr Lynn Dover,
Professor Jeremy Lakey
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The outer membrane protein OmpF from Escherichia coli is a member of a large family of β-barrel membrane proteins. Some, like OmpF, are pore-forming proteins while others are active transporters or enzymes. We have previously shown that the receptor-binding domain (R-domain) of the toxin colicin N binds with high affinity to OmpF reconstituted into tethered lipid bilayers on gold electrodes. The binding can be measured by surface plasmon resonance (SPR) and ion channel blockage (impedance spectroscopy, IS). In this paper we report the use of a mutant OmpF-E183C in which a single cysteine had been introduced on a short periplasmic turn. OmpF-E183C binds directly to gold surfaces and creates high-density protein layers by self-assembly from detergent solution. When the gold surface is pretreated with β-mercaptoethanol and thiolipids are added after the protein immobilisation step, the protein is shown, by Fourier transform infrared spectroscopy (FTIR), to retain its β-rich structure. Furthermore, we could also measure R-domain binding by SPR and IS, confirming the functional reconstitution of a self-assembled membrane protein monolayer at the gold surface. Because these β-barrel proteins are recognized protein engineering scaffolds, the method provides a generic method for the simple self-assembly of protein interfaces from aqueous solution.
Author(s): Terrettaz S, Ulrich W-P, Vogel H, Hong Q, Dover LG, Lakey JH
Publication type: Article
Publication status: Published
Journal: Protein Science
Print publication date: 01/01/2002
ISSN (print): 0961-8368
ISSN (electronic): 1469-896X
Publisher: Wiley-Blackwell Publishing
PubMed id: 12142446
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