Page 184 - Color Atlas of Biochemistry

Protein Metabolism 175

A. Protein metabolism: overview

Functional
proteins
10 000 g
Maturation Marking

Protein synthesis (300–400 g/day) Proteolysis (300–400 g/day) Proteasome Degradation
Sugars

Folding

Peptide Lysosome

Translation Degradation

Amino acid pool

100 g
Excess
amino
acids
Protein
Food secretion Glucose Lipids
50–100 g/day 50 g/day
De-novo
Resorption synthesis Degradation
Up to 150 g/day As required 50–100 g/day

2-Oxo- Ketone
acids bodies
Digestion

A
Pyruvate NH 3 PP P
Amino Phosphoenolpyruvate
acids ATP
3-Phosphoglycerate
2-Oxoacids
2
2
Sugar phosphates Urea CO , H O
Intestine

10g/day Kidney

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