Tertiary structure is the 3-D folding of a polypeptide chain, and quaternary structure is simply several chains folded into tertiary structure all tangled up together.

The process of going from primary structure to tertiary or quaternary structure establishes a protein's final shape, chemical properties, and cellular functions.

Below we delve more into the interactions that stabilize the tertiary structure (overall fold) and quaternary structure (interactions between subunits) of proteins.

The four levels of protein structure are primary, secondary, tertiary, and quaternary. It is helpful to understand the nature and function of each level of protein structure in order to fully …

Now, any protein that's made up of a single polypeptide is only going to have primary structure, secondary structure and tertiary structure, but if we're dealing with something like hemoglobin, …

The way these individual chains fit together into an overall three dimensional arrangement is called quaternary structure. Only multi-subunit proteins have quaternary structure.

So hopefully this gives you an appreciation for all of the interactions that might occur to give a protein a structure. And then last but not least, of course, you have the quaternary structure, …

A new drug is developed which selectively cleaves covalent bonds between two sulfur atoms of non-adjacent amino acids in a polypeptide chain. Which level of protein structure in affected …

Instead they self-associate to permanently exist as multiprotein assemblies or oligomers that define a protein’s quaternary structure. The left side of Figure 1 shows the formation of an …

This disrupts the quaternary structure of proteins that consist of more than one subunit. The bands visualized under reducing conditions reflect the size of the individual subunits.