SB228_Lecture_2_Lecture2 Lecture_2_Contents Polypeptide_Chain._Concept_2.1 The_Polypeptide_Chain Chemical_Structure The_Peptide_Group Amino_Acids._Concept_2.2 Amino_Acids Amino_Acid_Side_Chains Amino_Acid_Names Amino_Acid_Classification_1 Amino_Acids_Gly_and_Pro Amino_Acids_Cys Amino_Acids_Leu_and_Phe Amino_Acids_Glu_and_Arg Amino_Acids_Val_and_Ile Amino_Acid_Classification_2 Degrees_of_Freedom._Concept_2.3 Degrees_of_Freedom Backbone_Degrees_of_Freedom Steric_Clashes_Limit_Phi,_Psi Ramachandran_Diagram Different_Backbone_Conformations Contour_Plots Phi,_Psi_Distributions_A,_G,_P,_N Phi,_Psi_Distributions_A,_M,_F,_V Side_Chain_Conformations Reverse_Turns._Concept_2.4 Reverse_Turns Beta_Turns Virtual_Bonds Beta_Turn_Types The_Alpha_Helix._Concept_2.5 The_Alpha-Helix Proteins_Have_Helices The_Alpha_Heli The_Helix_Surface Helix_Surface_Ridges Helix_Ridge_Lines Different_Possible_Helices 310_Explained Alpha-Helix_Dipole_1 Alpha-Helix_Dipole_2 The_Beta_Sheet._Concept_2.6 Beta_Sheets Proteins_Have_Strands The_Beta_Strand Beta_Sheet Beta_Sheets_Are_Solid Beta-Sheet_Sidedness Real_Sheets_Are_Twisted_1 Real_Sheets_Are_Twisted_2 The_Beta_Hairpin