One of the amino acids in Table 27.1 is the biological precursor to γ-aminobutyric acid (4 aminobutanoic acid), which it forms by a decarboxylation reaction. Which amino acid is this?
Table 27.1

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TABLE 27.1 a-Amino Acids Found in Proteins (Continued) Abbreviation Structural formula* Name Amino acids with polar but nonionized side chains NH3 Gln (Q) Glutamine NH3 HOCH, CHco, Serine Ser (S) H NH3 Thr (T) CH3 HCO2 Threonine Amino acids with acidic side chains NHa Aspartic acid Asp (D) NH2 Glutamic acid Glu (E) OCCH2 NH3 но CH2 CO2 Tyrosine Tyr (Y) NH3 Cys () HSCH2 CHCO2 Cysteine Amino acids with basic side chains NH3 Lys (K) H3NCH2CH CH2CH2 CHCO2 Lysine NH2 NH Arg (R) H2NCNHCH2CH2 CH2-CHCO Arginine NH3 His (H) CH2-CHC02 Histidine