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Ribose-
phosphate
pyrophosphokinase
1
Ribose-
phosphate
pyrophosphokinase
2
Ribose-
phosphate
pyrophosphokinase
3
Ribose-
phosphate
pyrophosphokinase
4
Ribose-
phosphate
pyrophosphokinase
5
ATP
phosphoribosyltransferase
histidine
biosynthesis
trifunctional
protein
1-(5-
phosphoribosyl)-
5-[(5-
phosphoribosylamino)methylideneamino]
imidazole-4-
carboxamide
isomerase
Imidazole
glycerol
phosphate
synthase hisHF
Imidazoleglycerol-
phosphate
dehydratase
histidinol-
phosphate
aminotransferase
Histidinol-
phosphatase
histidine
biosynthesis
trifunctional
protein
histidine
biosynthesis
trifunctional
protein
histidine
biosynthesis
trifunctional
protein
D-Ribose
5-phosphate
ATP
AMP
H
+
Phosphoribosyl
pyrophosphate
ATP
H
+
PP
i
1-(5-
phosphoribosyl)-
ATP
H
2
O
Phosphoribosyl-
AMP
H
+
PP
i
PhosphoribosylformiminoAICAR-
phosphate
Phosphoribulosylformimino-
AICAR-P
L-Glutamine
L-Glutamic acid
H
+
AICAR
D-Erythro-
imidazole-
glycerol-
phosphate
H
2
O
Imidazole
acetol-
phosphate
L-Glutamic acid
Oxoglutaric
acid
L-histidinol
phosphate
H
2
O
L-Histidinol
P
i
NAD
H
+
NADH
Histidinal
H
2
O
NAD
H
+
NADH
L-Histidine
H
2
O
PRS1
PRS2
PRS3
PRS4
PRS5
HIS1
HIS4
HIS6
HIS7
HIS3
HIS5
HIS2
HIS4
HIS4
HIS4
DRib-5P
ATP
AMP
H
+
PRPP
ATP
H
+
PP
i
15PA
H
2
O
P-AMP
H
+
PP
i
PRFAC-P
PAICARP
Gln
Glu
H
+
AICAR
DEIGP
H
2
O
Imidazo
Glu
AKG
LHPhos
H
2
O
L-Hidol
P
i
NAD
H
+
NADH
Histidi
H
2
O
NAD
H
+
NADH
His
H
2
O