Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Polysulfide reductase (NrfD) is an integral transmembrane protein with loops in both the periplasm and the cytoplasm. NrfD is thought to participate in the transfer of electrons, from the quinone pool into the terminal components of the Nrf pathway.
References
Hussain H, Grove J, Griffiths L, Busby S, Cole J (April 1994). "A seven-gene operon essential for formate-dependent nitrite reduction to ammonia by enteric bacteria". Mol. Microbiol. 12 (1): 153–63. doi:10.1111/j.1365-2958.1994.tb01004.x. PMID8057835. S2CID31525696.