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Electrical Conductivity of Ferritin Proteins by Conductive AFM

By Gerald D. Watt, Degao Xu, Robert C. Davis and John N. Harb


Electrical conductivity measurements were performed on single apoferritin and holoferritin molecules by conductive atomic force microscopy. Conductivity of self-assembled monolayer films of ferritin molecules on gold surfaces was also measured. Holoferritin was 5-25 times more conductive than apoferritin, indicating that for holoferritin most electron-transfer goes through the ferrihydrite core. With 1 V applied, the average electrical currents through single holoferritin and apoferritin molecules were 2.6 PA and 0.19 PA, respectively

Topics: Chemistry and Materials (General)
Year: 2005
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