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J Am Chem Soc. 2009 Feb 11;131(5):1652-3. doi: 10.1021/ja808128s.

Simultaneous measurement of ionic current and fluorescence from single protein pores.

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Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.


The ability to simultaneously monitor both the ionic current and fluorescence from membrane channels and pores has the potential to link structural changes with function in such proteins. We present a new method for simultaneously measuring single-channel electrical currents and fluorescence from membrane proteins by using water-in-oil droplet bilayers. We demonstrate the simultaneous fluorescence and electrical detection of stochastic blocking by cyclodextrin in multiple staphylococcal alpha-hemolysin pores. The combined fluorescence signal from individual pores exhibits the same sequence of blocking events as the total current recording, showing that the two signals from each pore are correlated.

[Indexed for MEDLINE]

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