ID   1.1.3.39
DE   Nucleoside oxidase (H(2)O(2)-forming).
CA   Adenosine + 2 O(2) = 9-riburonosyladenine + 2 H(2)O(2).
CF   FAD; Heme.
CC   -!- Other purine and pyrimidine nucleosides (as well as
CC       2'-deoxynucleosides and arabinosides) are substrates, but ribose and
CC       nucleotides are not substrates.
CC   -!- The overall reaction takes place in two separate steps:
CC       (1) Adenosine + O(2) = 5'-dehydroadenosine + H(2)O(2).
CC       (2) 5'-dehydroadenosine + O(2) = 9-riburonosyladenine + H(2)O(2).
CC   -!- The 5'-dehydro nucleoside is being released from the enzyme to serve
CC       as substrate for the second reaction.
CC   -!- Differs from EC 1.1.3.28 as it produces hydrogen peroxide rather than
CC       water.
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