What is "choline-sulfatase"

In enzymology, a choline-sulfatase is an enzyme that catalyzes the chemical reaction

choline sulfate + HO $\rightleftharpoons$ choline + sulfate

Thus, the two substrates of this enzyme are choline sulfate and HO, whereas its two products are choline and sulfate.

This enzyme belongs to the family of hydrolases, specifically those acting on sulfuric ester bonds. The systematic name of this enzyme class is choline-sulfate sulfohydrolase.