- published: 26 May 2011
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Alanine (abbreviated as Ala or A) is an α-amino acid with the chemical formula CH3CH(NH2)COOH. The L-isomer is one of the 20 amino acids encoded by the genetic code. Its codons are GCU, GCC, GCA, and GCG. It is classified as a nonpolar amino acid. L-Alanine is second only to leucine in rate of occurrence, accounting for 7.8% of the primary structure in a sample of 1,150 proteins.D-Alanine occurs in bacterial cell walls and in some peptide antibiotics.
The α-carbon atom of alanine is bound with a methyl group (-CH3), making it one of the simplest α-amino acids with respect to molecular structure and also resulting in alanine's being classified as an aliphatic amino acid. The methyl group of alanine is non-reactive and is thus almost never directly involved in protein function.
Alanine is a nonessential amino acid, meaning it can be manufactured by the human body, and does not need to be obtained directly through the diet. Alanine is found in a wide variety of foods, but is particularly concentrated in meats.
When the life inside no doubt has died.
And you've turn your head away.
You tried to pay, but at the end of the day, it 's you again, alone.
Alone, confined. The mess in your mind.
When you can't relate to them.
You've reaped and sown, but little is known by those who aren't alone.
Why should a man learn not again what he has learned before?
He's overcome but must succumb to what he's living for.
He tried and tried. All those survived. He missed. He's fallen short.