Are there any proteins that contain one of each type of amino acid?
Consider the structure of proteins. They are described in terms of primary, secondary, tertiary, and quaternary structures. The first, or primary structure is simply the sequence of amino acids. Secondary structure refers to how this strand of amino acids is folded. Tertiary structure refers to how the secondary structure is again folded upon itself. Quaternary structure refers to the assemblage of more than one protein molecule and how they fit together to form an enzyme, or a mechanism to transport molecules across the cell membrane. In both the enzyme and the transport mechanism, the shape is extremely important. Not only do the correct amino acids have to be accessible for the substrate, but once the substrate has become attached, the Quaternary structure must move so as to catalyze a particular chemical reaction, or to move a molecule from one side of the cellular membrane to the other. With regard to your question, these proteins are obviously extraordinarily large polymers conta
