Secondary structure
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Secondary structure of a protein refers to the three-dimensional structure of local segments of a protein. Each type of secondary structure has segments that have a repeating conformational pattern which is produced by a repeating pattern of values for the phi and psi torsional angles. For this reason on a Ramachandran plot for a particular secondary structure the values for phi and psi are located at a particular area of the plot. for example alpha helices and beta sheets are secondary structure. The structure on the right of a human transferrin n-lobe mutant (PDB code 1dtg) is shown in cartoon backbone representation to highlight its secondary structure, with alpha-helices in magenta and beta-sheets in yellow.
For more information, see Wikipedia's page on secondary structure.
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Wayne Decatur, Karl Oberholser, Eric Martz, Eran Hodis, Joel L. Sussman, Karsten Theis
