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The primary structure of a protein is the sequence of amino acids in each of its chains. (Some proteins have more than one chain.)

This sequence determines how each chain coils and turns (the secondary structure), and in turn how the whole molecule folds (the tertiary structure). The correct primary structure is essential for the chain to acquire the correct three-dimensional (3-D) shape.

Some amino acids have negative charges on them at physiological pH; some positive. This will influence how different sections of a chain attract and repel one another, and in turn this affects the final shape. Also, one of the amino acids can form sulfur-sulfur cross-links between different parts of the chain. Hydrogen bonding can hold different sections of a chain in position, too, and this will only occur between certain amino acids.

If the protein is an enzyme, it has one or more active sites. Each of these has a shape that is complementary to part of the relevant substrate. So the enzyme must have the correct shape if it is to exhibit catalytic activity.

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