In enzymology, a choline sulfotransferase is an enzyme that catalyzes the chemical reaction 3'-phosphoadenylyl sulfate + choline ⇌ {\displaystyle \rightleftharpoons } adenosine 3',5'-bisphosphate + choline sulfateThus, the two substrates of this enzyme are 3'-phosphoadenylyl sulfate and choline, whereas its two products are adenosine 3',5'-bisphosphate and choline sulfate. Wikipedia