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Principles of protein structure

Updated: 4/28/2022
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Proteins have a number of 'levels' of structure associated with them: Primary, Secondary, Tertiatry and Quaternary.

Primary Structure

The order of amino acids in a protein determines it's primary structure.

Secondary Structure

The secondary structure is the simple folding of a protein into a shape. The two general shapes found are the alpha-helix (like a spiral) and the beta-pleated sheet (a little like the zigzag shape of a concertina). These shapes result from the intermolecular forces between R-groups on amino acids, and in the case of cystine, disulphide bridges.

Tertiary Structure

The tertiary structure is a further layer of folding of the secondary structure. Single-chain proteins reach their final form with this layer of folding.

Quaternery Structure

Only found in multi-unit protein complexes such as haemoglobin. This is a level involving the binding together of multiple protein chains to form a final structure. In the case of haemoglobin, this involves 4 main protein chains surrounding an Fe2+ ion.

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