1) Primary
Sequence of amino acids in a polypeptide chain
2) Secondary
First level of protein folding
Forms an alpha helix or a beta pleated sheet
3) Tertiary
Proteins in secondary structure can be folded to give a complex, compact 3D shape
Maintained by hydrogen bonds, ionic bonds, disulphide bridges and hydrophobic interaction
4) Quaternary
Two or more polypeptide chains in tertiary form combined
Can contain a prosthetic group e.g. haemoglobin
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