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S-
adenosylmethionine
decarboxylase
proenzyme
Spermidine
synthase
5'-
methylthioadenosine/S-
adenosylhomocysteine
nucleosidase
Spermidine
N(1)-
acetyltransferase
S-
adenosylmethionine
synthase
D-methionine
transport
system permease
protein metI
D-methionine-
binding
lipoprotein
metQ
D-methionine
transport
system permease
protein metI
D-methionine-
binding
lipoprotein
metQ
Methionine
import
ATP-binding
protein MetN
L-Methionine
S-
Adenosylmethionine
H
+
CO
2
S-
Adenosylmethioninamine
Putrescine
Spermidine
H
+
5'-S-methyl-
5'-
thioadenosine
H
2
O
5-
Methylthioribose
Adenine
Acetyl-CoA
N8-
Acetylspermidine
CoA
H
+
H
2
O
ATP
P
i
PP
i
L-Methionine
ATP
H
2
O
ADP
P
i
H
+
L-Methionine
ATP
H
2
O
ADP
PP
i
H
+
Pyruvic acid
Magnesium
Methionine
import
ATP-binding
protein MetN
Methionine
Biosynthesis
speD
speE
mtn
speG
metK
metI
metQ
metI
metQ
metN
L-Methionine
S-
Adenosylmethionine
Hydrogen Ion
Carbon dioxide
S-
Adenosylmethioninamine
Putrescine
Spermidine
Hydrogen Ion
5'-S-methyl-
5'-
thioadenosine
Water
5-
Methylthioribose
Adenine
Acetyl-CoA
N8-
Acetylspermidine
Coenzyme A
Hydrogen Ion
Water
Adenosine
triphosphate
Phosphate
Pyrophosphate
L-Methionine
Adenosine
triphosphate
Water
Adenosine
diphosphate
Phosphate
Hydrogen Ion
L-Methionine
Adenosine
triphosphate
Water
Adenosine
diphosphate
Pyrophosphate
Hydrogen Ion
metN
Methionine
Biosynthesis