BRAINCAKEQuaternary Structure
Large proteins consist of more than one polypeptide chain and possibly a non-peptide prosthetic group.
The polypeptide chains are held together by ionic, covalent (disulfide bridges) and hydrogen bonds.
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Key terms in this lesson
- hydrogen bond
- A weak electrostatic attraction between a slightly positive hydrogen atom on one polar molecule and a slightly negative atom, such as oxygen or nitrogen, on another.
- disulfide bridge
- A strong covalent bond formed between two sulfhydryl (-SH) groups of cysteine residues in a polypeptide.
More in Biological Molecules
- Amino-Acids
- Peptide Bond Formation
- Primary Structure
- Secondary Structure
- Tertiary Structure
- Test for Proteins
- Globular and Fibrous Proteins
- Collagen
All 29 lessons in Biological Molecules · All AQA AS-level Biology topics