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EC 1.1.3.28 Details
EC number
1.1.3.28
Accepted name
nucleoside oxidase
Reaction
inosine + O2 = 9-riburonosylhypoxanthine + H2O;; (1a) 2 inosine + O2 = 2 5′-dehydroinosine + 2 H2O;;(1b) 2 5′-dehydroinosine + O2 = 2 9-riburonosylhypoxanthine
Systematic name
nucleoside:oxygen 5′-oxidoreductase
CAS registry number
82599-71-1
Comment
Other purine and pyrimidine nucleosides (as well as 2′-deoxyribonucleosides) are substrates, but ribose and nucleotides are not substrates. The overall reaction takes place in two separate steps, with the 5′-dehydro nucleoside being released from the enzyme to serve as substrate for the second reaction. This enzyme differs from EC 1.1.3.39, nucleoside oxidase (H2O2-forming), as it produces water rather than hydrogen peroxide.
History
created 1992, modified 2001
EC Tree
1.1.1.68 created 1965, deleted 1978 [transferred to EC 1.1.99.15, deleted 1980]
1.1.1.70 created 1965, deleted 1978
1.1.1.74 created 1972, deleted 1976
1.1.1.89 created 1972, deleted 1976
1.1.1.109 created 1972, deleted 1976
1.1.1.139 created 1972, deleted 1978
1.1.1.155 created 1976, deleted 2004
1.1.1.171 created 1978, deleted 1984
1.1.1.180 created 1983, deleted 1984
1.1.1.182 created 1983, deleted 1990
1.1.1.204 created 1972 as EC 1.2.1.37, transferred 1984 to EC 1.1.1.204, modified 1989, deleted 2004
1.1.1.242 created 1992, deleted 2001
1.1.1.249 provisional version created 1999, deleted 1999 (reinstated 2001 as EC 2.5.1.46)
1.1.1.253 created 1999, deleted 2003
1.1.99.15 created 1978, deleted 1980
1.1.99.17 created 1982, deleted 2003