Recitation worksheet #2

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Feb 20, 2024

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Lahousse 1 CHE 4341 recitation Worksheet #2 Chapter 3. amino acids, peptides, and proteins. Part 1. Amino acids as buffers Complete at home: B, C, D, E, F. Suggested questions to work during recitation: A. Part 2. Drawing oligopeptides Complete at home: 2.A Part 3. Calculate net charge and isoelectric point for oligopeptides. Complete at home: Suggested questions to work during recitation: Part 1. Amino acids as buffers A) For the amino acid shown in the figure at pH=7.0 ]  Provide the one letter code for the amino acid  Correctly name and assign pK a to each functional group (pK a =2.17, pK a =9.04, pK a =12.48).  Draw the amino acid at pH= 1.0; pH=4.0; pH=9.0; pH=13  Which functional group will act as a buffer when pH=4.0 and more acid is added?  Which functional group will act as a buffer when pH=10.5 and more base is added?

Lahousse 2 B) For the amino acid shown in the figure at pH=7.0  Provide the one letter code for the amino acid  Correctly name and assign pK a to each functional group (pK a =1.96, pK a =10.28, pK a =8.18).  Draw the amino acid at pH= 2.0; pH=8.18; pH=11  Which functional group will act as a buffer when pH=9.0 and more acid is added?  Which functional group will act as a buffer when pH=3 and more base is added?

Lahousse 3 C) For the amino acid shown in the figure at pH=7.0  Provide the one letter code for the amino acid.  Correctly name and assign pK a to each functional group (pK a =2.02, pK a =8.08)  Draw the amino acid at pH= 1.0; pH=4.0; pH=8.08; pH=10  Which functional group will act as a buffer when pH=7.0 and more acid is added?  Which functional group will act as a buffer when pH=10.5 and more base is added?

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Lahousse 4 D) For the amino acid shown in the figure at pH=7.0  Provide the one letter code for the amino acid.  Correctly name and assign pK a to each functional group (pK a =1.83, pK a =9.13)  Draw the amino acid at pH= 1.8.3; pH=7.0; pH=11  Which functional group will act as a buffer when pH=1.0 and more acid is added?  Which functional group will act as a buffer when pH=8 and more base is added?

Lahousse 5 E) For the amino acid shown in the figure at pH=7.0  Provide the one letter code for the amino acid.  Correctly name and assign pK a to each functional group (pK a =2.19, pK a =9.67, pK a =4.25.  Draw the amino acid at pH= 1.0; pH=3.0; pH=6.0; pH=10  Which functional group will act as a buffer when pH=6.0 and more acid is added?  Which functional group will act as a buffer when pH=3.0 and more base is added?

Lahousse 6 F) For the amino acid shown in the figure at pH=7.0  Provide the one letter code for the amino acid.  Correctly name and assign pK a to each functional group (pK a =2.36, pK a =9.6)  Draw the amino acid at pH= 3.0; pH=7.4; pH=9.0; pH=10  Which functional group will act as a buffer when pH=2.0 and more acid is added?  Which functional group will act as a buffer when pH=9.6 and more base is added?

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Lahousse 7 Part 2. Drawing oligopeptides 2.A) Draw a tripeptide. Within the drawing: o Identify the phi, psi, and omega bonds in the tripeptide. o Explain why the omega bonds can’t rotate. o List and explain the factors that limit rotation of phi and psi angles.

Lahousse 8 Part 3. Calculate net charge and isoelectric point for the oligopeptides. 3.A) Draw the oligopeptide “ LEFT ”. For the oligopeptide calculate the net charge at pH= 4.25 and the pI. 3.B) Draw the oligopeptide “ RIGHT ”. For the oligopeptide calculate the net charge at pH= 9.0 and the pI. 3.C) Draw the oligopeptide “ DRY ”. For the oligopeptide calculate the net charge at pH= 6.0, pH= 11, and calculate the pI. 3.D) Draw the oligopeptide “ CIRCLE ”. For the oligopeptide calculate the net charge at pH= 3.0, pH= 8.18, and calculate the pI. 3.E) Draw the oligopeptide “ KAYAK ”. For the oligopeptide calculate the net charge at pH= 7.4 and calculate the pI.