Acknowledgements

I thank Ramesh Vuppada, a Master's student in our laboratory, who provided the preliminary results about the signaling states of the alternate conformations of PstB and Tanner Robinson, an undergraduate student, for the preliminary Tn-seq results. I also thank the many undergraduate and graduate students who have contributed to the ongoing work and discussions in the laboratory. Work from our laboratory was supported by Public Health Service grant R15GM96222 from the National Institute of General Medical Sciences.
