structure of proteins
Natural proteins always have a secondary and a tertiary structure, and only use natural amino acids.
- The primary structure of a protein is the sequence in which all those amino acids are connected within a molecule.
- The secondary structure of a protein is the 'helix' (see image); a spiral form of the primary structure.
- The tertiary structure of a protein is the way how that tertiary structure is threedimensionally folded.
- Sometimes there is an quaternary structure, of various packets of tertiary structure work toghether.
In the following structures you can see the primary, secundary and tertiary structure; and also the position of the 'co-enzym'.