Structure of Proteins 仪carbon atom CH-C- OH a-amino group R —side chain an d-amino acid 0 0 HN-CH-C-OH H2N-CH-C-OH H2N-CH-C- OH HN-CH-C-OH HN-CH-C-OH CH3 CH2OH H CH2SH CH(CH3)2 alanine serine glycine cysteine valine several individual amino acids peptide bonds ；-NH-CH-C-NH-CH- NH一CH NH-CH- NH-CH-C -8 CH3 CH2OH H CH>SH CH(CH32 a short section of a protein Copyright 2010 Pearson Prentice Hall,Inc. Chapter 24 3Chapter 24 3 Structure of Proteins