Organic Chemistry Study Guide and Solutions
6th Edition
ISBN: 9781936221868
Author: Marc Loudon, Jim Parise
Publisher: W. H. Freeman
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Question
Chapter 27, Problem 27.50AP
Interpretation Introduction
Interpretation:
The structure of the peptide P is to be predicted with the help of the given information.
Concept introduction:
The amino acid is made of two
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What peptides are expected to be produced when a-melanotropin
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Could you help me with this? I'm stuck on this question.
Given the following peptide SEPIMAPVEYPK(a) Estimate the net charge at pH 7 and at pH 12. Assume the pKa valuesgiven in as shown. (b) How many peptides would result if this peptide were treated with(1) cyanogen bromide, (2) trypsin, or (3) chymotrypsin?(c) Suggest a method for separating the peptides produced by chymotrypsintreatment.
Chapter 27 Solutions
Organic Chemistry Study Guide and Solutions
Ch. 27 - Prob. 27.1PCh. 27 - Prob. 27.2PCh. 27 - Prob. 27.3PCh. 27 - Prob. 27.4PCh. 27 - Prob. 27.5PCh. 27 - Prob. 27.6PCh. 27 - Prob. 27.8PCh. 27 - Prob. 27.9PCh. 27 - Prob. 27.10PCh. 27 - Prob. 27.11P
Ch. 27 - Prob. 27.12PCh. 27 - Prob. 27.13PCh. 27 - Prob. 27.14PCh. 27 - Prob. 27.15PCh. 27 - Prob. 27.16PCh. 27 - Prob. 27.17PCh. 27 - Prob. 27.18PCh. 27 - Prob. 27.19PCh. 27 - Prob. 27.20PCh. 27 - Prob. 27.21PCh. 27 - Prob. 27.22PCh. 27 - Prob. 27.23PCh. 27 - Prob. 27.24PCh. 27 - Prob. 27.25PCh. 27 - Prob. 27.26PCh. 27 - Prob. 27.27PCh. 27 - Prob. 27.28PCh. 27 - Prob. 27.29PCh. 27 - Prob. 27.30PCh. 27 - Prob. 27.31PCh. 27 - Prob. 27.32PCh. 27 - Prob. 27.33PCh. 27 - Prob. 27.34PCh. 27 - Prob. 27.35PCh. 27 - Prob. 27.36PCh. 27 - Prob. 27.37PCh. 27 - Prob. 27.38PCh. 27 - Prob. 27.39PCh. 27 - Prob. 27.40PCh. 27 - Prob. 27.41PCh. 27 - Prob. 27.42PCh. 27 - Prob. 27.43APCh. 27 - Prob. 27.44APCh. 27 - Prob. 27.45APCh. 27 - Prob. 27.46APCh. 27 - Prob. 27.47APCh. 27 - Prob. 27.48APCh. 27 - Prob. 27.49APCh. 27 - Prob. 27.50APCh. 27 - Prob. 27.51APCh. 27 - Prob. 27.52APCh. 27 - Prob. 27.53APCh. 27 - Prob. 27.54APCh. 27 - Prob. 27.55APCh. 27 - Prob. 27.56APCh. 27 - Prob. 27.57APCh. 27 - Prob. 27.58APCh. 27 - Prob. 27.59APCh. 27 - Prob. 27.60APCh. 27 - Prob. 27.61APCh. 27 - Prob. 27.62APCh. 27 - Prob. 27.63APCh. 27 - Prob. 27.64APCh. 27 - Prob. 27.65APCh. 27 - Prob. 27.66APCh. 27 - Prob. 27.67APCh. 27 - Prob. 27.68APCh. 27 - Prob. 27.69APCh. 27 - Prob. 27.70APCh. 27 - Prob. 27.71APCh. 27 - Prob. 27.72APCh. 27 - Prob. 27.73APCh. 27 - Prob. 27.74APCh. 27 - Prob. 27.75APCh. 27 - Prob. 27.76APCh. 27 - Prob. 27.77APCh. 27 - Prob. 27.78APCh. 27 - Prob. 27.79APCh. 27 - Prob. 27.80APCh. 27 - Prob. 27.81APCh. 27 - Prob. 27.82APCh. 27 - Prob. 27.83AP
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- Given the following peptideSEPIMAPVEYPK(a) Estimate the net charge at pH 7 and at pH 12. Assume the pKa valuesgiven in Table (b) How many peptides would result if this peptide were treated with(1) cyanogen bromide, (2) trypsin, or (3) chymotrypsin?(c) Suggest a method for separating the peptides produced by chymotrypsintreatment.arrow_forwardB. Devise a system to separate the N'-PRANCED-C' peptide from N'-HARK-C' (pKas 6.04, 10.54, 12.48, 2.1, 9.8) at pH 7. You must use at least two different methods to isolate them from one another. Please clearly state what kind of separations you will be using in each step and the fate of each molecule after each step.arrow_forward6arrow_forward
- A normal polypeptide and a mutant of the polypeptide were hydrolyzed by an endopeptidase under the same conditions. The normal and mutant poly peptide differ by one amino acid. The fingerprints of the peptides obtained from the two polypeptides are shown below. What kind of amino acid substitution occurred as a result of the mutation? (That is, is the substituted amino acid more or less polar than the original amino acid? Is its pI lower or higher?)arrow_forwardQuestion is in image.arrow_forward2arrow_forward
- The amino acid (S)-alanine has the physical characteristics listed under the structure. Label each of the following as optically active or inactive: a solution of pure (S)- alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine.arrow_forwardDraw the structure of the peptide ENDQCW. Draw the stereochemistry of the amino acids. Show the ionization state that would be the major form at pH 1. What is the isoelectric point of the peptide?arrow_forwardAn amino acid mixture of phenylalanine, glycine and glutamic acid is to be separated bypaper chromatography. The solvent is less polar than water. Which of these amino acids will have the highest Rf value and which the lowest? Explain. Treatment of a new protein with dansyl chloride reveals two (2) dansyl-labelled derivatives of amino acids, alanine and methionine. What can you deduce about the structure of the protein from these results? Name the amino acids that contribute atoms to both purine and pyrimidine rings.arrow_forward
- Explain why the pI of lysine is the average of the pKa values of its two protonated amino groups.arrow_forwardWhich separation technique is the most specific and offers the highest protein purification possible?arrow_forwardOn the paper provided, draw the chemical structure of a peptide with a sequence YIQV at pH 14. The pKa value of the Y sidechain is 10.1.arrow_forward
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