A protein key to the next green revolution sits for its portrait

Scientists are beginning to talk about re-engineering crop plants so that, like legumes, they will have on-site nitrogen-fixing systems, either in root nodules or in the plant cells themselves. The structure of a protein called NolR that acts as a master off-switch for the nodulation process, published in the April 29 issue of PNAS, brings them one step closer to this goal.