C and N terminus of polypeptide and which Amino Acid does not have chiral center?
In the molecule of a peptide, the amino acid residue on one end has an amine group on the alpha carbon. This amino acid residue is called the N-terminal of the peptide. The amino acid residue on the other end has a carboxylic acid group on the alpha carbon. This amino acid is called the C-terminal. When the structure of a peptide is drawn horizontally, by convention, the N-terminal is placed on the left and the C-terminal on the right.
Amino acids (except for glycine) have a chiral carbon atom adjacent to the carboxyl group (CO2-). This chiral center allows for stereoisomerism. The amino acids form two stereoisomers that are mirror images of each other. The structures are not superimposable on each other, much like your left and right hands.
#Glycine #CTerminal #NTerminal #polypeptide #aminoAcid #DNA #mRNA #codon #chiral
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