eLife assessment
This important study combines genetic analysis, biochemistry, and structural modeling to reveal new insights into how changes in protein-protein structure activate signal transduction as part of the bacterial general stress response. The data, collected using validated and standard methods, and the interpretations are solid, although additional experimental structural evidence would strengthen the proposed model and its potential application to other systems. This manuscript, which provides multiple avenues for follow-up studies, will be of broad interest to microbiologists, structural biologists, and cell biologists.