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N Use By Plants
Nitrate Assimilation
Ammonia Assimilation
Glu, Gln, Asn, Gly, Ser
Asp, Ala, GABA
Val, Leu, Ileu, Thr, Lys
Pro, Arg, Orn
Non-protein AAs
Sulfate Assimilation
Cys, Met, AdoMet, ACC
His, Phe, Tyr, Tryp
Secondary Products
Onium Compounds
HORT640 - Metabolic Plant Physiology

Proline, ornithine and arginine metabolism

The ornithine cycle and arginine synthesis

From: Thompson (1980)

7. Carbamoyl phosphate synthetase

2ATP + CO2 + glutamine + H2O ---> carbamoyl phosphate + glutamic acid + 2ADP + Pi

8. Carbamoyl phosphate: L-ornithine carbamoyltransferase (ornithine transcarbamylase)

Carbamoyl phosphate + ornithine ---> citrulline + Pi

9. Argininosuccinate synthetase

Citrulline + aspartate + ATP ---> argininosuccinate + AMP + PPi

10. Argininosuccinate lyase

Argininosuccinate ---> arginine + fumaric acid

11. Arginase

Arginine + H2O ---> ornithine + urea

12. Urease

Urea + H2O ---> 2NH3 + CO2

13. Arginine deiminase

Arginine + H2O ---> citrulline + NH3


Thompson JF 1980 Arginine synthesis, proline synthesis, and related processes. In "The Biochemistry of Plants", Vol 5 (BJ Miflin ed) Academic Press, New York, pp. 375-403.

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Last Update: 10/01/09