Protein structure

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Last updated 3:24 PM on 2/23/25
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4 Terms

1
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primary structure

  • Linear sequence of amino acids in a polypeptide chain

  • Determines the protein's unique characteristics.

2
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secondary structure

  • Local folding of the polypeptide chain

  • Forms alpha-helices and beta-pleated sheets

  • Stabilized by hydrogen bonds between backbone atoms.

3
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tertiary structure

  • Overall three-dimensional shape of a polypeptide

  • Results from interactions between amino acid side chains

  • Includes hydrophobic interactions, ionic bonds, and disulfide bridges.

4
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quaternary structure

  • Assembly of multiple polypeptide chains into a protein complex

  • Stabilized by interactions such as van der Waals forces, hydrogen bonds, and ionic interactions.