Table 5.2 mino Acid Composition of Some Selected Proteins Values expressed are percent representation of each amino acid. mino Acid ADH Histone Hs 9,8 13.3 117 8.2 1.7 13.3 49 2.0 1.0 3.0 6.7 3.7 1.5 0 2.6 Glu 3.7 10.2 9.0 5.2 7.0 1.5 lle 5.2 17 2 13.0 3.6 1.5 0.7 4.6 3.0 1.2 25 4.4 225 12 3.9 3.7 3.8 Trp 0 3 0 0 LI Acidic 84 10 13.7 8. 75 15.0 13.1 21.8 72 5.2 17 Hydrophobic 30.7 6 2.0 "Proteins are as follows: RNase: Bowine ribonuclease A, an enzyme: 124 amino acid residues. Note that RNase lacks tryptophan. ADH: Horse liver alcohol dehydrogenase, an enzyme, dimer of identical 374 amino acid polypeptide chains. The amino acid composition of ADH is reasonably representative of th Mh b: Sperm whale myoglobin, an oxygen binding protein; 15 amino acid residues. Note that Mb lacks cysteine. Histone H3: Histones are DNA-binding proteins found in chromosomes: 135 amino acid residues. Note the very basic nature of this protein due to its abundance of Arg and Lys esidues. It abo lacks tryptophan Collagen Collagen is an extracellular structural protein; 1052 amino acid residues, Collagen s an unusual amino acid composition; it is about one third glycine and is rich in proline