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A-Level Biology OCR A

Structure Bonds R Groups Tertiary Polypeptide Amino Acids Define

Tertiary structure represents the overall three-dimensional shape of a single polypeptide chain, maintained by various bonds formed between R-groups.

Tertiary structure is the final 3D shape of a polypeptide, resulting from R-group interactions, including disulfide bonds, ionic bonds, hydrophobic interactions, and hydrogen bonds.

Front Define tertiary structure and describe how it is held in place (all possible bonds).
Back Tertiary structure - final 3D structure of the polypeptide
  • Coiling of polypeptide into secondary structure brings R-groups of diff amino acids closer together - can interact causing further folding

Bonds involved (order of strength):
  • Disulfidfe bonds - covalent bond between two sulfur containing amino acids
  • Ionic bonds - between a basic and an acidic R-group
  • Hydrophobic interactions - between non-polar R-groups (in aqueous env. they will be on the inside and hydrophilic on the outside)
  • Hydrogen bonds - between polar/hydrophilic R-groups

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