Describe isoleucine (as shown in Table 4-1) using the RS system. TABLE 4-1 Covalent Structures and Abbreviations

Describe isoleucine (as shown in Table 4-1) using the RS system.

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TABLE 4-1 Covalent Structures and Abbreviations of the "Standard" Amino Acids of Proteins, Their Occurrence, and the pK Values of Their lonizable Groups Name, Three-letter Symbol, and One-letter Symbol Amino acids with nonpolar side chains Glycine Gly G Alanine Ala A Valine Val V Leucine Leu L COO T H-C-H NH3 COO T H-C-CH3 NH Structural Formula COO T H-C-CH T NH CH3 CH3 COO T H-C-CH-CH NH3 CH3 CH3 Residue Mass (D)b 57.0 71.1 99.1 113.2 Average Occurrence in Proteins (%) 7.1 8.2 6.9 9.7 PK Q-COOHd 2.35 2.35 2.29 2.33 pK a-NH3 +d 9.78 9.87 9.74 9.74 PKR Side Chaind