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Chapter 29: Q5P (page 1157)

What伪-halo carbonyl compoundis needed to synthesize each amino acid?

(a) Glycine

(b) Isoleucine

(c) Phenylalanine

Short Answer

Expert verified

Answer

a.

b.

c.

Step by step solution

01

Step  1: α-halocarbonyl compound

伪-halo carbonyl compound are compound that contain keto-group or 伪-halogen substitute in a carbonyl group. 伪-halo carbonyl compound acts as alkylating agents.

02

Step 2:Amino acids

Amino acids are classified as organic molecules that are accountable for protein formation when combined. It has carbonyl (acidic) and amino (basic) groups with a side (-R) chain.

03

Reaction

(a) When bromoacetic acid is treated with NH3in excess amount, it forms glycine.

Formation of glycine

b. When C9H9O2Br is treated with NH3in excess amount, it forms isoleucine

(c) When 6-bromohexanoic acid is treated with NH3in excess amount, it forms phenylalanine.

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Most popular questions from this chapter

Glutathione, a powerful antioxidant that destroys harmful oxidizing agents in cells, is composed of glutamic acid, cysteine, and glycine, and has the following structure:

a. What product is formed when glutathione reacts with an oxidizing agent?

b. What is unusual about the peptide bond between glutamic acid and cysteine?

Deduce the sequence of a heptapeptide that contains the amino acids Ala, Arg, Glu, Gly, Leu, Phe, and Ser, from the following experimental data. Edman degradation cleaves Leu from the heptapeptide, and carboxypeptidase forms Glu and a hexapeptide. Treatment of the heptapeptide with chymotrypsin forms a hexapeptide and a single amino acid. Treatment of the heptapeptide with trypsin forms a pentapeptide and a dipeptide. Partial hydrolysis forms Glu, Leu, Phe, and the tripeptidesGly鈥揂la鈥揝er and Ala鈥揝er鈥揂rg

Give the amino acid sequence of each peptide using the fragments obtained by partial hydrolysis of the peptide with acid.

  1. A tetrapeptide that contains Ala, Gly, His, and Tyr, which is hydrolyzed to the dipeptides His-Tyr, Gly-Ala, and Ala-His.
  2. A pentapeptide that contains Glu, Gly, His, Lys, and Phe, which is hydrolyzed to His-Gly-Glu, Gly-Glu-Phe, and Lys-His.

Draw the structure of the N-phenylthiohydantoin formed by initial Edman degradation of each peptide: (a) Ala-Gly-Phe-Phe; (b) Val-Ile-Tyr.

What is the predominant form of each of the following amino acids at pH=1? What is the overall charge on the amino acid at this pH?(a)threonine ; (b)methionine; (c)aspartic acid; (d)arginine
See all solutions

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