Mechanism of transmembrane signaling by sensor histidine kinases, was reported as Scientists investigate how the sense of smell works in bacteria …the signaling and inactive states differ only very slightly at the nitrate-binding site – by 0.5-1 angstroms, which is approximately one fifth of the size of the ion itself (1 angstrom is 10-10 meters). However, when this ion binds to the sensor, it causes huge changes in the protein: The helices of different monomers begin to move in different…