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