The primary structure of a protein is its linear sequence of amino acids and the location of any disulfide (-S-S-) bridges.
|Link to table describing the amino acids.|
|Link to a discussion of how the amino acids are linked together to form a polypeptide.|
Note the amino terminal or "N-terminal" (NH3+) at one end; carboxyl terminal ("C-terminal") (COO-) at the other.
|Link to a view of the primary structure of an actual protein, the 129-amino-acid enzyme, lysozyme.|