> Perchlorate reductase is usually encoded as a combination of four genes, denoted pcrABCD. ... The function of pcrD is uncertain, but may encode a molybdenum-c

> Perchlorate reductase is usually encoded as a combination of four genes, denoted pcrABCD. ... The function of pcrD is uncertain, but may encode a molybdenum-containing chaperone protein specific to assembling the pcrABC system Odd, why would a chaperone protein require Mo? edit: Ok, I see. Seems like pcrD is homologous to a part of the DMSO reductase and that has a chaperone that inserts the Mo cofactor (Molybdopterin) into the complex See https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6650914/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6650914/