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. 2014 Jun 26;4:5455. doi: 10.1038/srep05455

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(a) Pchlide reduction. The C17 = C18 double bond of Pchlide D-ring (yellow) is trans-reduced by DPOR (upper) and LPOR (lower) to form Chlide. (b) Close-up view of the catalytic site of NB-protein. The direct electron transfer from the NB-cluster to Pchlide is shown by a dashed blue arrow. The proton transfers from BchB'-Asp274 and the propionate to Pchlide are shown by dashed red arrows. (c–f) Schematic representation of the combination of WT-D274A NB-protein, and Pchlide-Chl c; the native combination (c), WT NB-protein and Chl c (d), D274A NB-protein and Pchlide (e) and D274A NB-protein and Chl c (f).