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Dark-operative protochlorophyllide (Pchlide) oxidoreductase is a nitrogenase-like enzyme consisting of the two components, L-protein (BchL-dimer) and NB-protein (BchN–BchB-heterotetramer). Here, we show that NB-protein is the catalytic component with Fe–S clusters. NB-protein purified from Rhodobacter capsulatus bound Pchlide that was readily converted to chlorophyllide a upon the addition of L-protein...
Dark-operative protochlorophyllide reductase (DPOR) in bacteriochlorophyll biosynthesis is a nitrogenase-like enzyme consisting of L-protein (BchL-dimer) as a reductase component and NB-protein (BchN–BchB-heterotetramer) as a catalytic component. Metallocenters of DPOR have not been identified. Here we report that L-protein has an oxygen-sensitive [4Fe–4S] cluster similar to nitrogenase Fe protein...
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