L-Ornithine

L-Ornithine is an intermediate in the urea cycle that is formed by action of the enzyme arginase on arginine.

Arginine + H2O <=> Urea + Ornithine

Ornithine is also combined with carbamoyl phosphate by action of the enzyme ornithine transcarbamoylase to form citrulline

Carbamoyl Phosphate + Ornithine <=> Citrulline + Pi

See also: Amino Acids Not In Proteins, , Arginine, Urea, Citrulline, Metabolism of Ornithine and Arginine

INTERNET LINKS:

1. Ornithine Metabolism

2. Urea Cycle and Metabolism of Amino Groups