Pyrrolysine is found in methanogenic organisms and other eukaryotes. The other three which are ‘non-standard’Īmino acids are pyrrolysine, selenocysteine and N-formylmethionine. (triplet) in genetic code and are called ‘ standard’Īmino acids. Of these 23, 20 proteinogenic amino acids are encoded by codons To note is that of these 500 amino acids, only 23 naturally occurring amino acids come under proteinogenic amino acids i.e. The word ‘proteinogenic’ means ‘protein building’. The two broad groups into which these aminoĪcids can be distributed are: proteinogenicĪmino acids. Group (COO -) and an amine group (NH 2) along with a sideĬhain (represented as R in the diagram) which is specific to every amino acid. Amino acids are the organic compounds mainly bonded to a hydrogen atom, a carboxyl Before going ahead and understanding proteins - the biomolecules, it is important to first understand amino acids.
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