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प्रश्न
Define the following as related to proteins:
Peptide linkage
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उत्तर
Chemically, peptide linkage is an amide formed between the –COOH group and –NH2 group. The reaction between two molecules of similar or different amino acids proceeds through the combination of the amino group of one molecule with the carboxyl group of the other. This results in the elimination of a water molecule and the formation of a peptide bond –CO–NH–. The product of the reaction is called a dipeptide because it is made up of two amino acids.
For example, when the carboxyl group of glycine combines with the amino group of alanine, we get a dipeptide, glycylalanine.
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संबंधित प्रश्न
Discuss the optical activity of lactic acid.
The correct statement for protein haemoglobin.
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Which of the following statement is correct:
Optical rotations of some compounds along with their structures are given below which of them have D configuration.
| (I) |  |
| (II) |  |
| (III) |  |
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(i) Insulin
(ii) Keratin
(iii) Albumin
(iv) Myosin
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Structures of glycine and alanine are given below. Show the peptide linkage in glycylalanine.
\[\ce{\underset{(Glycine)}{H2N - CH2 - COOH}}\];
\[\begin{array}{cc}
\ce{H2N - CH2 - COOH}\\
|\phantom{......}\\
\ce{\underset{(Alanine)}{CH3}\phantom{...}}
\end{array}\]
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Assertion: β-glycosidic linkage is present in maltose,
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Peptide linkage is:
Presence of disulphide link gives rise to which structure of protein?
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Assertion (A): Proteins are polymers of α-amino acids connected by a peptide bond.
Reason (R): A tetrapeptide contains 4 amino acids linked by 4 peptide bonds.
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