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1.17.3.2: xanthine oxidase

This is an abbreviated version!
For detailed information about xanthine oxidase, go to the full flat file.

Word Map on EC 1.17.3.2

Reaction

xanthine
+
H2O
+
O2
=
Urate
+
H2O2

Synonyms

AXOR, EC 1.1.3.22, EC 1.2.3.2, EC 1.2.3.2., hypoxanthine oxidase, hypoxanthine-xanthine oxidase, hypoxanthine:oxygen oxidoreductase, More, oxidase, xanthine, Schardinger enzyme, xanthine dehydrogenase/oxidase, xanthine oxidase, xanthine oxidoreductase, xanthine: oxygen oxidoreductase, xanthine:O2 oxidoreductase, xanthine:oxygen oxidoreductase, xanthine:xanthine oxidase, XnOx, XO, XOD, XOR

ECTree

     1 Oxidoreductases
         1.17 Acting on CH or CH2 groups
             1.17.3 With oxygen as acceptor
                1.17.3.2 xanthine oxidase

General Stability

General Stability on EC 1.17.3.2 - xanthine oxidase

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GENERAL STABILITY
ORGANISM
UNIPROT
LITERATURE
heparin-Sepharose 6B-bound enzyme, half-life: 120 h and 67 h at 4°C and 20°C respectively, free enzyme, 61 h and 45 h at 4°C and 67°C respectively
-
low operational stability by immobilization
-
phosphate stabilizes
-
rat liver enzyme is unstable as dehydrogenase and is gradually converted to oxidase
-
stable for more than 1 year with alternate freezing and thawing
-
the enzyme from animal tissues can be interconverted to EC 1.1.1.204, that from liver exists in vivo mainly as the dehydrogenase form, but can be converted into the oxidase form by storage at -20°C, by treatment with proteolytic enzymes or with organic solvents, or by thiol reagents such as Cu2+, N-ethylmaleimide or 4-hydroxymercuribenzoate, the effect of the thiol reagents can be reversed by thiols such as 1,4-dithioerythritol, in other animal tissues the enzyme exists almost entirely as EC 1.1.3.22 but can be converted into the dehydrogenase form by 1,4-dithioerythritol
the xanthine dehydrogenase form can be obtained through incubation of xanthine oxidase with sulfhydryl reducing reagents
-