Question

Draw the structure of the following amino acids, dipeptides, and tripeptides at low pH (pH 1) and high pH (pH 14). At each pH, assume that all functional groups that might do so are ionized.
e. Gln-Ala-Asn

Accepted Answer

Step 1: Understand the problem. You are tasked with drawing the structure of the tripeptide Gln-Ala-Asn (Glutamine-Alanine-Asparagine) at two different pH levels: low pH (pH 1) and high pH (pH 14). At each pH, you need to account for the ionization states of the functional groups in the amino acids. Step 2: Recall the ionizable groups in amino acids. Amino acids have an amino group (-NH2), a carboxyl group (-COOH), and sometimes ionizable side chains. At low pH, the amino group is protonated (-NH3⁺), and the carboxyl group is not ionized (-COOH). At high pH, the amino group is deprotonated (-NH2), and the carboxyl group is ionized (-COO⁻). Step 3: Analyze the specific amino acids in the tripeptide. Glutamine (Gln) and Asparagine (Asn) have side chains that are not ionizable under physiological pH ranges, so their side chains remain neutral. Alanine (Ala) also has a non-ionizable side chain (a methyl group). Focus on the terminal amino and carboxyl groups of the peptide and their ionization states at the given pH levels. Step 4: Draw the structure at low pH (pH 1). At this pH, the N-terminal amino group of Gln will be protonated (-NH3⁺), the C-terminal carboxyl group of Asn will be in its non-ionized form (-COOH), and the peptide bonds between the amino acids will remain neutral. Ensure that the side chains of Gln, Ala, and Asn are drawn in their neutral forms. Step 5: Draw the structure at high pH (pH 14). At this pH, the N-terminal amino group of Gln will be deprotonated (-NH2), the C-terminal carboxyl group of Asn will be ionized (-COO⁻), and the peptide bonds will remain neutral. Again, ensure that the side chains of Gln, Ala, and Asn are drawn in their neutral forms, as they are not ionizable under these conditions.

Draw the structure of the following amino acids, dipeptides, and tripeptides at low pH (pH 1) and high pH (pH 14). At each pH, assume that all functional groups that might do so are ionized.
e. Gln-Ala-Asn

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Concetti chiave

Amino Acid Structure

Peptide Bonds

Ionization at Different pH Levels

Draw the structure of the following amino acids, dipeptides, and tripeptides at low pH (pH 1) and high pH (pH 14). At each pH, assume that all functional groups that might do so are ionized.e. Gln-Ala-Asn

Risposta video verificata per un problema simile:

Concetti chiave

Amino Acid Structure

Peptide Bonds

Ionization at Different pH Levels

Draw the structure of the following amino acids, dipeptides, and tripeptides at low pH (pH 1) and high pH (pH 14). At each pH, assume that all functional groups that might do so are ionized.
e. Gln-Ala-Asn