amino_acids

amino_acids - Amino Acids Found in Proteins - Part 1 1998...

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©1998 by Alberts, Bray, Johnson, Lewis, Raff, Roberts, Walter . http://www.essentialcellbiology.com Amino Acids Found in Proteins - Part 1 THE AMINO ACID The general formula of an amino acid is + H H 2 N COOH R C R is commonly one of 20 different side chains. At pH 7 both the amino and carboxyl groups are ionized. H H 3 N COO R C a -carbon atom carboxyl group side-chain group OPTICAL ISOMERS The a -carbon atom is asymmetric, which allows for two mirror image (or stereo-) isomers, L and D. H NH 3 + COO R C a COO R H NH 3 + Proteins consist exclusively of L-amino acids. C a L D PEPTIDE BONDS Amino acids are commonly joined together by an amide linkage, called a peptide bond. H H H OH O C C N R H H H OH O C C N R H H H C N R H C R OH O C C O N H H 2 O Peptide bond: The four atoms in each gray box form a rigid planar unit. There is no rotation around the C–N bond. H
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amino_acids - Amino Acids Found in Proteins - Part 1 1998...

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