👉 Sulfurase, also known as a ferric iron-sulphate reductase (FIRS), is an enzyme found in some bacteria and fungi that catalyzes the reduction of sulfur dioxide (SO2) to sulfur (S). It's responsible for converting SO2 into SO3, which is then reduced further by another enzyme, the sulfate-reducing菌素(SR). This process is essential for photosynthesis in plant cells.