Activating factor for the iron protein of nitrogenase from Rhodospirillum rubrum

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Science  22 Oct 1976:
Vol. 194, Issue 4263, pp. 424-426
DOI: 10.1126/science.824729


As isolated from Rhodospirillum rubrum, the iron protein of nitrogenase has little or no activity. It can be activated by incubating it with a trypsin-sensitive, oxygen-labile component (activating factor) plus adenosine triphosphate and a divalent metal ion. After activation, the iron protein retains its nitrogenase activity when the activating factor is removed.