Substrate-dependent transmembrane signaling in TonB-dependent transporters is not conserved.

@article{Kim2007SubstratedependentTS,
  title={Substrate-dependent transmembrane signaling in TonB-dependent transporters is not conserved.},
  author={Miyeon Kim and Gail E. Fanucci and David S Cafiso},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2007},
  volume={104 29},
  pages={
          11975-80
        }
}
Site-directed spin labeling (SDSL) was used to examine and compare transmembrane signaling events in the bacterial outer-membrane transport proteins BtuB, FecA, and FhuA. These proteins extract energy for transport by coupling to the transperiplasmic protein TonB, an interaction that is thought to be mediated by the Ton box, a highly conserved energy-coupling motif in these transporters. In the ferric citrate transporter, FecA, SDSL indicates that the Ton box undergoes a substrate-induced… CONTINUE READING

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