Draw the structure of the dipeptide Ala-Gly.
ANALYSIS You need the names and structures of the two amino acids. Since alanine is named first, it is amino-terminal and glycine is carboxyl-terminal. Ala-Gly must have a peptide bond between the alanine $-COOH^-$ and the glycine $-NH_3 ^+$ .

Question

Draw the structure of the dipeptide Ala-Gly.
ANALYSIS You need the names and structures of the two amino acids. Since alanine is named first, it is amino-terminal and glycine is carboxyl-terminal. Ala-Gly must have a peptide bond between the alanine [latex]-COOH^-[/latex] and the glycine [latex]-NH_3 ^+[/latex].

Accepted Answer

The structures of alanine and glycine, and the structure of the Ala-Gly dipeptide are

[latex]\underset{Alanine (Ala)}{\begin{array}{r c} O \qquad \; \ _+ \qquad \qquad || \qquad \enspace \ H_3N - CH - C - O^- \ | \qquad \qquad \quad \; \ CH_3 \qquad \quad \enspace \; \end{array}} \quad \underset{Glycine (Gly)}{\begin{array}{r c} O \qquad \; \ _+ \qquad \qquad \> || \qquad \enspace \ H_3N - CH_2 - C - O^- \ \ \ \end{array}}[/latex]

and

Question 18.4: Draw the structure of the dipeptide Ala-Gly. ANALYSIS You ne...

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