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Endoplasmic Reticulum
3-ketoacyl-CoA
thiolase,
peroxisomal
3-hydroxy-3-
methylglutaryl-
coenzyme A
reductase 1
Delta(14)-
sterol
reductase
Hydroxymethylglutaryl-
CoA synthase
mevalonate
kinase
Phosphomevalonate
kinase
Diphosphomevalonate
decarboxylase
Isopentenyl-
diphosphate
Delta-isomerase
Farnesyl
pyrophosphate
synthase
Farnesyl
pyrophosphate
synthase
Squalene
synthase
squalene
monooxygenase
Lanosterol
synthase
Lanosterol
14-alpha
demethylase
Delta(14)-
sterol
reductase
Methylsterol
monooxygenase
Methylsterol
monooxygenase
Methylsterol
monooxygenase
C-3 sterol
dehydrogenase
3-keto sterol
reductase
Methylsterol
monooxygenase
Methylsterol
monooxygenase
Methylsterol
monooxygenase
C-3 sterol
dehydrogenase
3-keto sterol
reductase
Sterol 24-C-
methyltransferase
C-8 sterol
isomerase
C-5 sterol
desaturase
C-22 sterol
desaturase
C-8 sterol
isomerase
C-5 sterol
desaturase
Acetyl-CoA
CoA
Acetoacetyl-CoA
3-Hydroxy-3-
methylglutaryl-
CoA
NADPH
Mevalonic acid
NADP
CoA
ergosta-
5,7,22,24(28)-
tetraen-3-β- ol
H
+
NADPH
Ergosterol
NADP
7-
Dehydrodesmosterol
Desmosterol
Acetyl-CoA
Acetoacetyl-CoA
H
2
O
CoA
Mevalonic acid
ATP
Mevalonic
acid-5P
ADP
ATP
Mevalonic
acid-5P
ADP
(R)-5-
Diphosphomevalonic
acid
ATP
ADP
P
i
Isopentenyl
pyrophosphate
CO
2
Isopentenyl
pyrophosphate
Dimethylallylpyrophosphate
Isopentenyl
pyrophosphate
Geranyl-PP
PP
i
Geranyl-PP
Isopentenyl
pyrophosphate
Farnesyl
pyrophosphate
PP
i
NADPH
Squalene
NADP
PP
i
Squalene
O
2
NADPH
(S)-2,3-
Epoxysqualene
H
2
O
NADP
Lanosterol
O
2
NADPH
4,4-
Dimethylcholesta-
8,14,24-
trienol
Formic acid
NADP
H
2
O
NADPH
4,4-Dimethyl-
5a-cholesta-
8,24-dien-3-
b-ol
NADP
H
+
O
2
NADPH
4α-
hydroxymethyl-
4β-methyl-5α-
cholesta-
8,24-dien-3β-
ol
NADP
H
2
O
H
+
O
2
NADPH
4α-formyl-4β-
methyl-5α-
cholesta-
8,24-dien-3β-
ol
H
2
O
NADP
O
2
NADPH
4β-methyl-4α-
carboxy-
cholesta-
8,24-dien-3β-
ol
H
2
O
NADP
NADP
3-Keto-4-
methylzymosterol
CO
2
NADPH
NADPH
H
+
NADP
4a-
Methylzymosterol
H
+
O
2
NADPH
H
2
O
NADP
4α-
hydroxymethyl-
5α-cholesta-
8,24-dien-3β-
ol
H
+
O
2
NADPH
4α-formyl-5α-
cholesta-
8,24-dien-3β-
ol
H
2
O
NADP
O
2
NADPH
4α-carboxy-
5α-cholesta-
8,24-dien-3β-
ol
H
2
O
NADP
NADP
5α-cholesta-
8,24-dien-3-
one
CO
2
NADPH
NADPH
H
+
Zymosterol
NADP
S-
Adenosylmethionine
fecosterol
S-
Adenosylhomocysteine
H
+
Episterol
H
+
O
2
ferrocytochrome
c
5,7,24(28)-
Ergostatrienol
H
2
O
ferricytochrome
c
H
+
NADPH
O
2
ergosta-
5,7,22,24(28)-
tetraen-3-β- ol
NADP
H
2
O
5a-cholesta-
7,24-dien-3B-
ol
7-
Dehydrodesmosterol
Cholesterol
Stearidonoyl-
CoA
CoA
CE(18:0)