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globular proteins

Globular proteins are proteins that consist of long chains of amino acids folded up into complex shapes. Globular proteins serve as, or form important components of, the following:
  • Enzymes
  • Hormones
  • Antibodies
  • Some structural proteins. (Globular proteins form part of the cell membrane, which has a structural role as well as a role in transporting ions in and out the cell)
The structure of globular proteins has been traditionally discussed in terms of four levels of structure: primary, secondary, tertiary, and quaternary. Two additional levels are now commonly distinguished: motifs and domains.

Compare with fibrous protein.

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