What is the essential amino acid content in actual human muscle protein?
Posted in Muscle Protein on 10. Mar, 2010
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Humans can produce 10 of the 20 amino acids. The others must be supplied in the food. Failure to obtain enough of even 1 of the 10 essential amino acids, those that we cannot make, results in degradation of the body’s proteins —muscle and so forth— to obtain the one amino acid that is needed. Unlike fat and starch, the human body does not store excess amino acids for later use—the amino acids must be in the food every day. The essential amino acids include:
Arginine
Histidine
Isoleucine
Leucine
lysine
Methionine is an amino acid that has antioxidant properties. Methionine acts as a methyl donor. Methionine may be converted to SAM-e.
Phenylalanine – Tyrosine is produced from phenylalanine, so if the diet is deficient in phenylalanine, tyrosine will be required as well.
Trypophan
Valine
The amino acids arginine, methionine and phenylalanine are considered essential for reasons not directly related to lack of synthesis. Arginine is synthesized by mammalian cells but at a rate that is insufficient to meet the growth needs of the body and the majority that is synthesized is cleaved to form urea. Methionine is required in large amounts to produce cysteine if the latter amino acid is not adequately supplied in the diet. Similarly, phenyalanine is needed in large amounts to form tyrosine if the latter is not adequately supplied in the diet.
http://www.biology.arizona.edu/biochemistry/problem_sets/aa/aa.html