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In enzymology, an adenosylhomocysteine nucleosidase is an enzyme that catalyzes the chemical reaction

Thus, the two substrates of this enzyme are S-adenosyl-L-homocysteine and H2O, whereas its two products are S--L-homocysteine and adenine.

This enzyme belongs to the family of hydrolases, specifically those glycosylases that hydrolyse N-glycosyl compounds. The systematic name of this enzyme class is S-adenosyl-L-homocysteine homocysteinylribohydrolase. Other names in common use include S-adenosylhomocysteine hydrolase , S-adenosylhomocysteine nucleosidase, 5'-methyladenosine nucleosidase, S-adenosylhomocysteine/5'-methylthioadenosine nucleosidase, and AdoHcy/MTA nucleosidase. This enzyme participates in methionine metabolism.

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