BRAINCAKECollagen
Collagen is a fibrous protein that is found in tendons, bones, muscles, skin and blood. It comprises three-quarters of the skin and a third of all the protein in the human body.
The primary structure is the sequence of amino acids that gives rise to an unbranched polypeptide chain. Every third amino-acid is glycine. The other amino-acids are mostly proline, hydroxyproline and lysine.
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Key terms in this lesson
- primary structure
- The sequence of amino acids in a polypeptide chain, joined by peptide bonds.
- tertiary structure
- The overall three-dimensional shape of a single polypeptide chain, formed and held by bonds between R groups.
- quaternary structure
- The structure formed when two or more polypeptide chains, or a polypeptide and a prosthetic group, combine to form a functional protein.
- fibrous protein
- An insoluble, structural protein made of long, parallel polypeptide chains, such as collagen or keratin.
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