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Science 6 November 1992:
Vol. 258. no. 5084, pp. 992 - 995
DOI: 10.1126/science.1359643
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Articles
Science, Vol 258, Issue 5084, 992-995
Copyright © 1992 by American Association for the Advancement of Science
Nucleotide-iron-sulfur cluster signal transduction in the nitrogenase iron-protein: the role of Asp125
D Wolle,
DR Dean,
and
JB Howard
Department of Biochemistry, University of Minnesota, Minneapolis 55455.
Electron transfer in nitrogenase involves a gating process initiated by MgATP (magnesium adenosine triphosphate) binding to Fe-protein. The redox site, an 4Fe:4S cluster, is structurally separated from the MgATP binding site. For MgATP hydrolysis to be coupled to electron transfer, a signal transduction mechanism is proposed that is similar to that in guanosine triphosphatase proteins. Based on the three-dimensional structure of Fe-protein, Asp125 is likely to be part of a putative transduction path. Altered Fe-protein with Glu replacing Asp has been prepared and retains the ability for the initial nucleotide-dependent conformational change. However, either MgADP or MgATP can induce the shift and Mg binding to the nucleotide is no longer essential.
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