Please answer parts F and G. The previous parts have been answered with explanations. Only parts F and G need to be answered and explained. Please do so thoroughly and efficiently with clear explanations. 1. The peptide below was isolated from fermented milk andshown to have antioxidant propertiesLactobacillus delbrueckii subsp.,bulgaricus IFO13953N-Ala-Arg-His-Pro-His-Pro-His-Leu-Ser-Phe-Met-Ca) Draw the primary structure of the from the N-terminal to theC-terminal G. Make sure that the ends and the R groups are inthe ionization state that would be expected at biological pH=7.b) Place a box around each of the peptide bonds.c) Write the sequence using 1 letter abbreviations.d) What is the net charge of the peptide at pH=7? Calculate thepl.e) Draw the titration curve for the polypeptide and show wherethe pl and buffering regions are..f) Identify -R groups that:●Are hydrophobic, hydrophilic and aromaticAre the H-bond donors and acceptors by placing a d or ana by the appropriate atom• can take part in electrostatic interactions. For the R groupsthat are charged at pH=7, list the other possible charged Rgroups that would interact favorably with the chargedgroup in the peptide. (these should be chosen from the listof all common amino acids)9) Explain how the pKa of an amino acid can differ depending onits chemical environment, either aqueous or hydrophobic. Considerboth and acidic and basic amino acid in your explanation. (oneparagraph).

In the study of peptides and proteins, understanding their structural and chemical properties is…

f) Identify -R groups that: Are hydrophobic, hydrophilic and aromatic • Are the H-bond donors and acceptors by placing a d or an a by the appropriate atom • can take part in electrostatic interactions. For the R groups that are charged at pH=7, list the other possible charged R groups that would interact favorably with the charged group in the peptide. (these should be chosen from the list of all common amino acids) g) Explain how the pKa of an amino acid can differ depending on its chemical environment, either aqueous or hydrophobic. Consider both and acidic and basic amino acid in your explanation. (one paragraph).

f) Identify -R groups that: Are hydrophobic, hydrophilic and aromatic • Are the H-bond donors and acceptors by placing a d or an a by the appropriate atom • can take part in electrostatic interactions. For the R groups that are charged at pH=7, list the other possible charged R groups that would interact favorably with the charged group in the peptide. (these should be chosen from the list of all common amino acids) g) Explain how the pKa of an amino acid can differ depending on its chemical environment, either aqueous or hydrophobic. Consider both and acidic and basic amino acid in your explanation. (one paragraph).

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question

Please answer parts F and G. The previous parts have been answered with explanations. Only parts F and G need to be answered and explained. Please do so thoroughly and efficiently with clear explanations.

1. The peptide below was isolated from fermented milk and
shown to have antioxidant properties
Lactobacillus delbrueckii subsp.,
bulgaricus IFO13953
N-Ala-Arg-His-Pro-His-Pro-His-Leu-Ser-Phe-Met
-C
a) Draw the primary structure of the from the N-terminal to the
C-terminal G. Make sure that the ends and the R groups are in
the ionization state that would be expected at biological pH=7.
b) Place a box around each of the peptide bonds.
c) Write the sequence using 1 letter abbreviations.
d) What is the net charge of the peptide at pH=7? Calculate the
pl.
e) Draw the titration curve for the polypeptide and show where
the pl and buffering regions are..
f) Identify -R groups that:
●
Are hydrophobic, hydrophilic and aromatic
Are the H-bond donors and acceptors by placing a d or an
a by the appropriate atom
• can take part in electrostatic interactions. For the R groups
that are charged at pH=7, list the other possible charged R
groups that would interact favorably with the charged
group in the peptide. (these should be chosen from the list
of all common amino acids)
9) Explain how the pKa of an amino acid can differ depending on
its chemical environment, either aqueous or hydrophobic. Consider
both and acidic and basic amino acid in your explanation. (one
paragraph).

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