Amino acid content of some proteins

▪ Table

Amino acid content of some proteins

protein

amino acid* alpha-casein gliadin edestin collagen

(ox hide) keratin

(wool) myosin

lysine 60.9 4.45 19.9 27.4 6.2 85

histidine 18.7 11.7 18.6 4.5 19.7 15

arginine 24.7 15.7 99.2 47.1 56.9 41

aspartic acid** 63.1 10.1 99.4 51.9 51.5 85

threonine 41.2 17.6 31.2 19.3 55.9 41

serine 63.1 46.7 55.7 41.0 79.5 41

glutamic acid** 153.1 311.0 144.9 76.2 99.0 155

proline 71.3 117.8 32.9 125.2 58.3 22

glycine 37.3 — 68.0 354.6 78.0 39

alanine 41.5 23.9 57.7 115.7 43.8 78

half-cystine 3.6 21.3 10.9 0.0 105.0 86

valine 53.8 22.7 54.6 21.4 46.6 42

methionine 16.8 11.3 16.4 6.5 4.0 22

isoleucine 48.8 90.8*** 41.9 14.5 29.0 42

leucine 60.3 60.0 28.2 59.9 79

tyrosine 44.7 17.7 26.9 5.5 28.7 18

phenylalanine 27.9 39.0 38.4 13.9 22.4 27

tryptophan 7.8 3.2 6.6 0.0 9.6 —

hydroxyproline 0.0 0.0 0.0 97.5 12.2 —

hydroxylysine —   —   —   8.0 1.2 —

total 839   765   883   1,058       863   832

average residual weight 119   131   113   95   117   120

*Number of gram molecules of amino acid per 100,000 grams of protein.

**The values for aspartic acid and glutamic acid include asparagine and glutamine, respectively.

***Isoleucine plus leucine.

See as table:

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