which one is not a standard amino acid but is found in the urea cycle? Please explain.
malate |
|
oxaloacetate |
|
arginine |
|
ornithine |
Ornithine is not a standard amino acid, but is an integral part of the urea cycle. Ornithine is produced as one of the products of the action of arginase enzyme of L-arginine to create urea. Ornithine aids in the removal of excess nitrogen from the body and is recycled by the urea cycle, thereby acting as a catalyst. However, ornithine is not coded by DNA and hence, is not a standard amino acid. The structure of ornithine is shown below.
Structure of ornithine (taken from internet sources)
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