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Dark-operative protochlorophyllide oxidoreductase (DPOR) is a nitrogenase-like enzyme consisting of two components, L-protein as a reductase component and NB-protein as a catalytic component. Elucidation of the crystal structures of NB-protein (Muraki et al., Nature 2010, 465: 110–114) has enabled us to study its reaction mechanism in combination with biochemical analysis. Here we demonstrate that...
Dark-operative protochlorophyllide oxidoreductase, a nitrogenase-like enzyme, contains two [4Fe–4S] clusters, one in the L-protein ((BchL) 2 ) and the other in the NB-protein ((BchN–BchB) 2 ). The reduced NB-cluster in the NB-protein, which is ligated by 1Asp/3Cys residues, showed a broad S=3/2 electron paramagnetic resonance signal that is rather rare in [4Fe–4S] clusters. A 4Cys-ligated...
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