680 CHAPTER 19 BIOMOLECULES: AMINO ACIOS, PEPTIDES, AND PROTEINS TABLE 19.1 The

Question

680 CHAPTER 19 BIOMOLECULES: AMINO ACIOS, PEPTIDES, AND PROTEINS TABLE 19.1 The 20 Common Amino Acids in Proteins Name Abbreviations MW Stucture Neutral Amino Acids 6.01 2.34 Alanine Ala A 89 H3C Asparagine AsN132 H2N 2.028.805.41 CysteineCys 1.96 10.28 .18 5.07 C 121 H3N H 217 9.13.5 5.65 Glutamine Gl146 H2N H3N Glycine Cly 75 H 2.34 9.60 5.97 CH3 2.36 9.60 -6.02 Isoleucine le I131 H3C. H3N H LeucineLeu L 131 H3C 2.369.60 5.98 Methionine MetM 149 2.28 9.215.74 H3C H3N Phenylalanine Phe F 165 1.83 5.48 H3N H Proline Pro P 115 1.99 10.606.30 N H

Explanation / Answer

In proteins formation, the amino group of one amino acid links to the carboxylic group of other aminoacid andforms a peptide bond.Inthis way amino acids links with each other and forms proteins.

If aldehyde or keto groups present in the side chains of the amino acids, then they also undergoes reaction with the amino group of amino acids and forms imine derivatives. so many side reactions occur. and also the imine (C=NH) derivatives are biologically less potent.

these are the complications if carbonyl group is present in aminoacid side chain.

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