DNA-mediated signaling by the E. coli helicase, DinG
2015
The protein DinG is an ATP-dependent helicase from E. coli that contains a 4Fe-4S cluster. DNA-modified
gold electrodes were used to measure the midpoint redox potential of the DNA-bound protein, which was found
to be ∼80 mV vs. Using a 20-mer with a 15-mer single-stranded overhang as a helicase substrate on the
DNA-modified electrodes, it was shown that enzymic activity via the hydrolysis of ATP increased the intensity of
the electrochem. signal intensity. Whether DinG and EndoIII, a base excision repair enzyme also contg. a 4Fe-
4S cluster, use DNA-mediated charge transport (CT) chem. for inter-protein signaling was tested using
several techniques. Using a single mol. at. force microscopy assay, it was shown that DinG and EndoIII
preferentially redistribute to strands of DNA that contain DNA damage via long-range DNA-mediated CT. To
test this signaling within cells, genetics expts. were used that strongly suggest that DinG and EndoIII utilize
DNA-mediated signaling to cooperate in redistributing DinG to its target lesion.
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