Electrochemically Gated Long Distance Charge Transport in Photosystem I
2019
The transport of electrons along photosynthetic and
respiratory chains involves a series of
enzymatic reactions that are coupled through
redox mediators, including proteins and small molecules. The use of native and
synthetic redox probes is key to
understand charge transport mechanisms, and to design bioelectronic sensors and solar energy conversion devices. However,
redox probes have limited tunability to exchange charge at the desired
electrochemical potentials (energy levels) and at different protein sites.
Here, we take advantage of electrochemical scanning tunneling microscopy
(ECSTM) to control the Fermi energy and nanometric position of the ECSTM probe in order to study electron transport in
individual photosystem I (PSI) complexes. Current-distance measurements at
different potentiostatic conditions
indicate that PSI supports long-distance
transport that is electrochemically gated near the redox potential of P700,
with current extending farther under hole injection conditions.
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