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Pathways for sulfate reduction in higher plants. The upper scheme illustrates the adenosine 5′-phosphosulfate (APS) (5′-adenylylsulfate) sulfotransferase pathway and the lower scheme depicts a microorganism-like APS kinase/3′-phosphoadenosine-5′-phosphosulfate (PAPS) reductase pathway. The numbers refer to the following enzymes 1 = ATP sulfurylase, 2 = thiosulfate reductase, 3 = sulfite reductase, 4 = O-acetylserine(thiol)lyase.
