Draw the structure of a tripeptide, in the form that would predominate at pH 7. When drawing your peptide, choose amino acids that satisfy the criteria below. Draw rectangles to mark all sets of 6 atoms that form rigid planes in the tripeptide. a) one of the residues has a side chain R-group that is aromatic. b) one of the residues has a side chain R-group that is acidic. c) one of the residues has a side chain R-group that can act as a nucleophile.

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Chapter1: Chemical Foundations
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5. Draw the structure of a tripeptide, in the form that would predominate at pH 7. When
drawing your peptide, choose amino acids that satisfy the criteria below. Draw rectangles
to mark all sets of 6 atoms that form rigid planes in the tripeptide.
a) one of the residues has a side chain R-group that is aromatic.
b) one of the residues has a side chain R-group that is acidic.
c) one of the residues has a side chain R-group that can act as a nucleophile.
6. Identify all amino acids whose R-groups can act as hydrogen bond donors at pH 14. Write
the three letter abbreviation when naming each amino acid below.
7. How many potential ionic bonds can aspartic acid form at pH = 9? State the location of all
relevant atoms that can participate.
Transcribed Image Text:5. Draw the structure of a tripeptide, in the form that would predominate at pH 7. When drawing your peptide, choose amino acids that satisfy the criteria below. Draw rectangles to mark all sets of 6 atoms that form rigid planes in the tripeptide. a) one of the residues has a side chain R-group that is aromatic. b) one of the residues has a side chain R-group that is acidic. c) one of the residues has a side chain R-group that can act as a nucleophile. 6. Identify all amino acids whose R-groups can act as hydrogen bond donors at pH 14. Write the three letter abbreviation when naming each amino acid below. 7. How many potential ionic bonds can aspartic acid form at pH = 9? State the location of all relevant atoms that can participate.
Use the following pka chart to answer questions in this problem set.
Amino acid side chain
ASP
GLU
HIS
TYR
LYS
CYS
ARG
Amino acid -COOH group
Amino acid a-NH: group
Oligopeptide C-terminal a-COOH group
Oligopeptide N-terminal a-NH"group
pka
3.9
6.0
10.5
10.5
8.4
12.5
2.1
9.6
3.6
74
Transcribed Image Text:Use the following pka chart to answer questions in this problem set. Amino acid side chain ASP GLU HIS TYR LYS CYS ARG Amino acid -COOH group Amino acid a-NH: group Oligopeptide C-terminal a-COOH group Oligopeptide N-terminal a-NH"group pka 3.9 6.0 10.5 10.5 8.4 12.5 2.1 9.6 3.6 74
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