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Chapter 29: Q2P (page 1156)

What form exists at the isoelectric point of each of the following amino acids: (a) valine; (b)leucine; (c)proline; (d) glutamic acid

Short Answer

Expert verified

Answer

a.

b.

c.

d.

Step by step solution

01

Isoelectric point

The isoelectric point denoted as pI constitutes the pH at which a specific molecule comprises a total electrical charge of zero. The pI of the molecule comprising one amine and a carboxyl group can be evaluated according to the formula:

02

Amino acid

Organic compounds possessing a carboxylic group and an amino group together with an alkyl group are amino acids. The different categories of amino acids comprise essential and non-essential amino acids.

03

Step 3:Identification of the form that exists at the isoelectric point of each amino acid

(a)The form existing at the isoelectric point for the amino acid, valine is given as:

(b)The form existing at the isoelectric point for the amino acid, leucine is given as:

(c)The form existing at the isoelectric point for the amino acid, proline is given as:

(d)The form existing at the isoelectric point for the amino acid of glutamic acid is given as:

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Most popular questions from this chapter

After the peptide chain of collage has been formed, many of the proline residues are hydroxylated on one of the ring carbon atoms. Why is this process important for the triple helix of collagen?

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.

What aldehyde is needed to synthesize each amino acid by the Strecker synthesis?

(a) Valine;

(b) Leucine;

(c) Phenylalanine.

Devise a synthesis of the following dipeptide from amino acid starting materials.

Draw the structure of leu-enkephalin, a pentapeptide that acts as an analgesic and opiate, and has the following sequence: Tyr–Gly–Gly–Phe–Leu. (The structure of a related peptide, met-enkephalin,

appeared in Section 22.6B.)
See all solutions

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