Page 162 - Color Atlas of Biochemistry

Carbohydrate Metabolism 153

A. Pentose phosphate pathway: oxidative part

P O CH 2 CO 2 P O H H O H
H O OH PPP –
H oxidative H C C C C C H
OH H part
HO H N A N A H OH OH OH
2 2
H OH P P
Glucose 6-phosphate NADP NADPH + H Ribulose 5-phosphate

B. Reactions

P O H H O H P P P P P P
Ribulose Ribulose
6 H C C C C C H
5-phosphate 5- P
H OH OH OH

6 N A
P 6CO 2
3
P P P P P P a Ribose
6 N A 5- P
P
b Xylulose
P O H H OH H O 5- P
a b b
6-Phospho- H C C C C C C
6 4
gluconate
H OH OH H OH O
P P Sedo-
Anabolic 2 a heptulose
pathways P P 7- P
H O
P O CH 2 2 b Glyceral
6-Phospho- H O a b 3- P
6 glucono- H
lactone OH H C O 5
HO
H OH P P Fructose
a
P P 6- P
6 N A
P b Erythrose
1 4- P
6 N A a b
P
4
P O CH 2
P P P a Fructose
Glucose H O OH 6- P
6
6-phosphate H P P
OH H b Glycer-
aldehyde
HO H 3- P
a a b
H OH

1 Glucose 6-phosphate dehydrogenase 1.1.1.49 4 Transketolase 2.2.1.1

2 Gluconolactonase 3.1.1.17 5 Transaldolase 2.2.1.2

3 Phosphogluconate dehydrogenase (decarboxylating) 1.1.1.44

Koolman, Color Atlas of Biochemistry, 2nd edition © 2005 Thieme
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