Chapter 21: Q22P (page 1002)
What amino acid is formed using the N-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?
(a)
(b)
Short Answer
(a)
(b)
Chapter 21: Q22P (page 1002)
What amino acid is formed using the N-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?
(a)
(b)
(a)
(b)
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Get started for freeShow the steps in the synthesis of the tetrapeptide in problem 34, using Merrifield’s method.
a. Why is the pKaof the glutamate side chain greater than the pKaof the aspartate side chain?
b. Why is the pKa of the arginine side chain greater than the pKa of the lysine side chain?
A decapeptide undergoes partial hydrolysis to give peptides whose amino acid composition is shown. Reaction of the intact decapeptide with Edman’s reagent releases PTH-Gly. What is the sequence of the decapeptide?
1.Ala, Trp
2. Val,Pro,Asp
3. Pro, Val
4. Ala, Glu
5. Trp, Ala, Arg
6.Arg, Gly
7.Glu, Ala, Leu
8. Met, Pro, Leu, Glu
An opioid pentapeptide has the following structure: Tyr-Cys-Gly-Phe-Cys
a. Draw the structure of the pentapeptide including all the side chains.
b. Write its structure following mild oxidation.
Draw the product obtained when a lysine side chain in a polypeptide reacts with maleic anhydride.
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