User:Eleanor Crabb/Sandbox 2
From Proteopedia
Protein structure
Returning now to both chains in the structure 1z3a we will use this to identify the four tiers of protein structure.
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The primary structure is simply the arrangement of amino acid residues with in the chain. This can be emphasized by colouring Chain A according to . Hover your cursor over the molecule to identify some of the different residues present in the protein.
The protein can also be coloured according to the secondary structure. The here are the alpha-helices shown in pink, beta-sheets in yellow, with the interconnecting loops in white. Rotate the molecule to look at these features in more detail. If we now consider just the we can see how this secondary structure is held together by hydrogen bonds.
As an enzyme, this protein is an example of a globular protein as we can see when consider the space-filled representation of the entire protein, both chains A and B. This the tertiary structure of the protein.
Finally, the quaternary structure here refers . In this particular example
