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beta sheet

A Dictionary of Biology | 2004 | 405 words | Copyright

beta sheet (β-pleated sheet) A form of secondary structure in proteins in which extended polypeptide chains lie parallel to each other and are linked by hydrogen bonds between the N–H and C=O groups (see illustration). Beta sheets occur in many globular proteins and link polypeptides of the same type in certain fibrous proteins, including fibroin (the protein of silk). Compare alpha helix.

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