Important Terms (Protein Structure)

Primary structure Linear sequence of amino acids in a polypeptide.

Quaternary structure Arrangement of polypeptides in macromolecular assembly.

Secondary structure A description of the three-dimensional structure adopted by a localized sections of the polypeptide chain.

Tertiary structure A description of the arrangement of secondary structural elements within the protein. Units of length 1A = 0.1 nm.

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