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Chapter 29: Q2. (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


(a)


(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

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:

Form existing at the isoelectric point for valine

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

Form existing at the isoelectric point for leucine

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Most popular questions from this chapter

Give the amino acid sequence of an octapeptide that contains the amino acids Tyr, Ala, Leu (2 equiv), Cys, Gly, Glu and Val, and forms the following fragments when partially hydrolyzed with HCl: Val-Cys-Gly-Glu, Ala-Leu-Tyr, and Tyr-Leu-Val-Cys.

Write out the steps for the synthesis of each peptide using the Merrifield method:

  1. Ala-Leu-Phe-Phe; (b) Phe-Gly-Ala-Ile.

What steps are needed to convert A to L-dopa, an uncommon amino acid that is effective in treating Parkinson’s disease? These steps are the key reactions in the first commercial asymmetric synthesis using a chiral transition metal catalyst. This process was developed at Monsanto in 1974.

Draw the organic products formed in each reaction

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