Protein structure
Protein structure
Real World
Haemoglobin has quaternary structure with four polypeptide subunits — a mutation in just one amino acid of the primary sequence causes sickle cell anaemia, studied extensively at the MRC Laboratory of Molecular Biology in Cambridge.
Exam Focus
Link each structural level to its stabilising interactions: primary = peptide bonds, secondary = backbone H-bonds, tertiary = side-chain interactions, quaternary = subunit assembly.
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