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The activity of the nitrogenase enzyme in the diazotroph Azospirillum brasilense is reversibly inactivated by ammonium through ADP-ribosylation of the nitrogenase NifH subunit. This process is(More)
Ammonium movement across biological membranes is facilitated by a class of ubiquitous channel proteins from the Amt/Rh family. Amt proteins have also been implicated in cellular responses to ammonium(More)
In Azospirillum brasilense ADP-ribosylation of dinitrogenase reductase (NifH) occurs in response to addition of ammonium to the extracellular medium and is mediated by dinitrogenase reductase(More)