A functional unit of the tertiary structure of a protein . It consists of chains of amino acids folded into alpha helices and beta sheets to form a globular structure. Different domains are linked together by relatively straight sections of polypeptide chain to form the protein molecule.
Domains allow a degree of movement in the protein structure.
See also finger domain . In some classification systems, the highest taxonomic category, consisting of one or more kingdoms . Archaea Dictionary of Biology, Oxford University Press 2. Eukarya Dictionary of Biology, Oxford University Press 4. All rights reserved.