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sulfite reductase (NADPH) hemoprotein, beta-component Sulfite reductase (NADPH) catalyzes a six electron reduction of sulfite to sulfide in prokaryotic organisms. It is a complex oligomeric enzyme composed of two different peptides with a subunit composition of alpha(8)-beta(4). The alpha component, encoded by cysJ, is a flavoprotein containing both FMN and FAD, while the beta component, encoded by cysI, is a siroheme, iron-sulfur protein. In Salmonella typhimurium and Escherichia coli, both the alpha and beta subunits of sulfite reductase are located in a unidirectional gene cluster along with phosphoadenosine phosphosulfate reductase, which catalyzes a two step reduction of PAPS to give free sulfite. In cyanobacteria and plant species, sulfite reductase ferredoxin (EC 1.8.7.1) catalyzes the reduction of sulfite to sulfide. [Central intermediary metabolism, Sulfur metabolism]
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