Collagen and Keratin

Collagen

Collagen () is a group of naturally occurring proteins found in animals, especially in the flesh and connective tissues of vertebrates.

collagen n : a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling

Collagen \Col"la*gen\, n. [Gr. ko`lla glue + -gen.] (Physiol. Chem.) The chemical basis of ordinary connective tissue, as of tendons or sinews and of bone. On being boiled in water it becomes gelatin or glue. [1913 Webster]

Keratin

Keratin () is a family of fibrous structural proteins. Keratin is the key structural material making up the outer layer of human skin.

keratin n : a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair feathers nails and hooves [syn: {ceratin}]

keratin \ker"a*tin\, n. [Gr. ke`ras, -atos, horn.] (Physiol. Chem.) A sulfur-containing fibrous protein constituting the main structural protein of hard epidermal tissues, such as horn, hair, feathers, nails, claws, hoofs, and the like. It is an insoluble substance, and, unlike elastin, is not dissolved even by gastric or pancreatic juice. By decomposition with sulphuric acid it yields leucine and tyrosine plus various other acid-stable amino acids. The amino acid composition varies, but it usually has a high percentage of cystine, which stabilizes and insolubilizes the protein by forming intrachain linkages. A softer form of keratin is present in the epidermis and whalebone. Called also {epidermose}. [1913 Webster +PJC]

Data Sources:

  • collagen: WordNet (r) 2.0
  • collagen: The Collaborative International Dictionary of English v.0.44
  • keratin: WordNet (r) 2.0
  • keratin: The Collaborative International Dictionary of English v.0.44

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