Secondary Structure.

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Secondary Structure

Phi () and Psi () Page 8

Ramachandran Plot Page 9

Figure 1 The classical version of the Ramachandran plot for a) alanine (but often taken as typical for all non-glycines) and b) glycine according to Ramachandran and Saisekharan, 1968. The fully allowed regions are shaded, the partially allowed regions are enclosed by a solid line. The connecting regions enclosed by the dashed lines are permissible with slight flexibility of bond angles. These plots were arrived at by computer modelling. Although some overall features of these plots are correct, the details differ from the experimentally observed Ramachandran plots for c) all 19 non-glycines and d) glycine.

Anti-parallel beta sheet Page 18

Antiparallel beta sheet Page 18

Parallel beta sheet Page 19

right-handed

Alpha Helix Page 15

Dipole moment of an alpha helix Page 16

carboxy i+4 i+3 i+2 i+1 i amino

Helical Wheels Page 16