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Xanthine
dehydrogenase/oxidase
Allopurinol
transporter
Allopurinol
transporter
Purine
nucleoside
phosphorylase
Adenosine
deaminase
Purine
nucleoside
phosphorylase
Xanthine
dehydrogenase/oxidase
Guanine
deaminase
Xanthine
dehydrogenase/oxidase
Oxypurinol
Allopurinol
Uric acid
Allopurinol
Allopurinol
Allopurinol
Adenosine
P
i
Adenine
Ribose 1-phosphate
H
2
O
Inosine
NH
3
P
i
Hypoxanthine
Ribose 1-phosphate
O
2
H
2
O
Xanthine
H
2
O
2
Guanine
H
2
O
NH
3
NAD
H
2
O
NADH
Zinc (II) ion
FAD
2Fe-2S
Molybdopterin
Zinc (II) ion
FAD
2Fe-2S
Molybdopterin
Gout
FAD
2Fe-2S
Molybdopterin
Hepatocyte
Cytosol
Allopurinol can be converted
into oxypurinol which is an
active metabolite
Allopurionol and oxypurinol
inhibits xanthine
oxidase/dehydrogenase
leading to reduced uric acid
production
Uric acid produces symptoms
of gout, therefore, low
levels of uric acid reduce
incidence of gout symptoms
Liver
XDH
Unknown
Unknown
PNP
ADA
PNP
XDH
GDA
XDH
Oxypurinol
Allopurinol
Uric acid
Allopurinol
Allopurinol
Allopurinol
Adenosine
Phosphate
Adenine
Ribose
1-phosphate
Water
Inosine
Ammonia
Phosphate
Hypoxanthine
Ribose
1-phosphate
Oxygen
Water
Xanthine
Hydrogen
peroxide
Guanine
Water
Ammonia
NAD
Water
NADH
Gout