1.8.4.8	adenosine 3',5'-bisphosphate + sulfite + thioredoxin disulfide = 3'-phosphoadenylyl sulfate + thioredoxin	special ping-pong mechanism with 5-phosphoadenosine 3-phosphosulfate reacting with the reduced enzyme isomer in a Theorell-Chance mechanism	
1.8.4.8	adenosine 3',5'-bisphosphate + sulfite + thioredoxin disulfide = 3'-phosphoadenylyl sulfate + thioredoxin	from the kinetic data it is concluded that the enzyme follows an ordered mechanism with thioredoxin as the first substrate followed by 5-phosphoadenosine 3-phosphosulfate as the second	
1.8.4.8	adenosine 3',5'-bisphosphate + sulfite + thioredoxin disulfide = 3'-phosphoadenylyl sulfate + thioredoxin	ping pong type reaction mechanism	
1.8.4.8	adenosine 3',5'-bisphosphate + sulfite + thioredoxin disulfide = 3'-phosphoadenylyl sulfate + thioredoxin	ping pong type reaction mechanism, Cys239 is the active site residue