Biology / Bio 0212 · Atom · ~20 seconds
Protein Secondary Structure
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A protein's secondary structure is a repeating fold — a coiled helix or a folded sheet — held by hydrogen bonds along the backbone.
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A stretch of amino acids coils into a helix when hydrogen bonds form at regular intervals between atoms in its backbone.
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Secondary structure describes a local fold in one stretch of the chain, not the protein's overall shape.