![]() The oligomeric form of CRR3 likely functions to assemble the core of SubB to form the peak III complex as an assembly intermediate. Accumulation of the largest peak III complex was impaired in mutants defective in the SubB subunits PnsB2-PnsB5. In Suc density gradient centrifugation, CRR3 was detected in three protein complexes. Here, we found that CHLORORESPIRATORY REDUCTION3 (CRR3) is an assembly factor required for the accumulation of subcomplex B (SubB) of chloroplast NDH. In Arabidopsis ( Arabidopsis thaliana), chloroplast NDH is composed of at least 29 subunits and associates with two copies of PSI to form the NDH-PSI supercomplex. The chloroplast NADH dehydrogenase-like (NDH) complex is structurally similar to respiratory complex I and mediates PSI cyclic electron flow.
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