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Secondary structure

The secondary structure of proteins describes the folding or coiling of the polypeptide chain to form local substructures. The structures are sustained by hydrogen bonds.

There are two main types of secondary structure:

$$\alpha$$-helix $$\beta$$-pleated sheet
  • Spiral shaped
  • The most common secondary structure
  • Zigzag shaped
  • Exists as parallel or antiparallel sheets

A protein may consist of more than one secondary structure. For instance, a short section may form an $${\alpha}$$ helix, whilst another may form a $${\beta}$$ sheet.

Overall, proteins formed from a combination of secondary structures.
Overall, proteins formed from a combination of secondary structures.