3.D.1.8.2
The photosynthetic/respiratory NAD(P)H-quinone oxidoreductase subunits A - Q and S. NdhP and NdhQ are peptides of 42 and 39 aas, identified by cryoEM at 3.3 Å resolution (Schuller et al. 2019). NDH-1 (NdhA) shuttles electrons from reduced ferridoxin, via FMN and iron-sulfur (Fe-S) centers, to quinones in the respiratory and photosynthetic chains. The immediate electron acceptor for the enzyme in this species is believed to be plastoquinone. The system couples the redox reaction to proton translocation, and thus conserves the redox energy in a proton gradient (Schuller et al. 2019). Ferridoxin directly mediates electron transfer between photosystem I and complex I. Ferridoxin efficiently binds to complex I with subunit NdhS being the key component in this process (Schuller et al. 2019).