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3.0 Types of Secondary Structure

There are three common secondary structures in proteins, namely alpha helices, beta sheets, and turns. That which cannot be classified as one of the standard three classes is usually grouped into a category called "other" or "random coil". This last designation is unfortunate as no portion of protein three dimensional structure is truly random and it is usually not a coil. A number of "other" secondary structures types have been proposed, however they represent a small fraction of residues and may not be a general structural principle of proteins. A common element of most secondary structures is the presence of characteristic hydrogen bonds e.g., C=O of residue i to HN of residue i+4 (i, i+4). See also Hydrogen Bonds (4.1).

3.1 - Helices
3.1.1 - alpha helix
3.1.2 - 3.10 helix
3.1.3 - pi-helix
3.1.4 - Selected topics
3.2 - Sheets
3.2.1 - Antiparallel
3.2.2 - Parallel
3.2.3 - Twists
3.2.4 - Bulges
3.2.5 - Strand connections
3.3 - Turns
3.4 - Other

No Title - 31 MAY 96
written by Kurt D. Berndt, Karolinska Institute, Stockholm, Sweden
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