LEHNINGER PRINCIPLES OF BIOCHEMISTRY David L. Nelson and Michael M. Cox LEHNINGER PRINCIPLES OF BIOCHEMISTRY Sixth Edition CHAPTER 3 Amino Acids, Peptides, and Proteins © 2013 W. H. Freeman and Company
Some functions of proteins
Stereoisomerism in amino acids
Conventions to identify carbons in amino acids
Two cysteines can form a cystine, also called a disulfide bond
Amino acids can act as acids and bases
Formation of a peptide bond
The pentapeptide serylglycyltyrosylalanylleucine Ser-Gly-Tyr-Ala-Leu or SGYAL
Amino acid sequence of bovine insulin
Direct Protein Sequencing
Protein sequencing chemistry
Breaking disulfide bonds in proteins