A new gene controlling sulphite reductase in Aspergillus nidulans.

Summary A new gene designated sG was identified in Aspergillus nidulans by mutation affecting the enzyme sulphite reductase and leading to a strong derepression of arylsulphatase and enzymes constituting the alternative pathway of cysteine synthesis. The results indicate that proper physiological functioning of this pathway is strongly dependent on full activity of the sulphate assimilation pathway.