The 20 Common Amino Acids

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∟The 20 Common Amino Acids

This section provides a quick introduction of the 20 common amino acids that make up human proteins. Amino acid names, abbreviations, formulas, weghts and structures are provided..

What Are The 20 Common Amino Acids? - The 20 common amino acids are 20 types of amino acids that are connected together to form proteins. So far we have identified roughly 500 types of amino acids in nature.

The table below lists the 20 common amino acids with their names, abbreviations and other properties:

 #   Name              Abbr.   Formula        Weight
--   -------------   -------   ----------   --------
 1   Alanine         ala   A   C3H7NO2       89.0935
 2   Arginine        arg   R   C6H14N4O2    174.2017
 3   Asparagine      asn   N   C4H8N2O3     132.1184
 4   Aspartic Acid   asp   D   C4H7NO4      133.1032
 5   Cysteine        cys   C   C3H7NO2S     121.1590
 6   Glutamine       gln   Q   C5H9NO4      147.1299
 7   Glutamic acid   glu   E   C5H10N2O3    146.1451
 8   Glycine         gly   G   C2H5NO2       75.0669
 9   Histidine       his   H   C6H9N3O2     155.1552
10   Isoleucine      ile   I   C6H13NO2     131.1736
11   Leucine         leu   L   C6H13NO2     131.1736
12   Lysine          lys   K   C6H14N2O2    146.1882
13   Methionine      met   M   C5H11NO2S    149.2124
14   Phenylalanine   phe   F   C9H11NO2     165.1900
15   Proline         pro   P   C5H9NO2      115.1310
16   Serine          ser   S   C3H7NO3      105.0930
17   Threonine       thr   T   C4H9NO3      119.1197
18   Tryptophan      trp   W   C11H12N2O2   204.2262
19   Tyrosine        tyr   Y   C9H11NO3     181.1894
20   Valine          val   V   C5H11NO2     117.1469